Good to see this up

Mostly very happy with the changes. Now that you've taken over and are shaping things it would probably be better to call it version 5 of the list?
Bit of a longer post - I suggested to PFE I could post up a list of the issues and possible changes I had in mind had I got the AC position, as there could be things he hadn't thought of or may want to consider and Greg was happy with me posting it up.
I like that Howling Banshees have infiltrate now, seems fitting for them. Personally I'd have kept the infantry only MW as that fitted the background very well for them, but dropped their CC to 4+ as CC3+ inf-MW was OTT. Straight CC2+ makes them excellent in CC against vehicles whereas any 40k Eldar player would know they shouldn't be – 8 Howling Banshees could charge a Defiler formation and have a good chance of wiping the deadly CC vehicles out before they're able to attack, whereas in 40K due to having only S3 HB wouldn't be able to damage a Defiler (or any vehicle) at all.
Guardians should definitely have Falcons as a transport option – please allow them to! It's a bizarre omission and list screw up that they don't have it, it would be the equivalent of the SM list having Razorbacks only available to Devestators for no reason. Falcons were Guardian's standard transport vehicle in every other version of epic and they've always used the Falcon in 40k Eldar codexes. Look:

Wave Serpents will probably be mostly favoured and used anyway, for their better cost and armour, but I expect the option of Falcons to be allowed. Players from older editions of epic will probably have large collections of Falcons but maybe only a small number of WS – even if a bit unoptimal to use them as transports it would be good for them to be able to use their collection as is without needing to convert or buy WS.
Some typos - the Biel-tann Aspect Warrior Warhost should be 8 strong, with the availability of 2 Exarches. The Autarch upgrade shouldn't allow a Wraithseer to be taken either, they're just for the Iyanden list. Engine of Vaul text should have a comma in place of the first or: “Cobra, Scorpion or Storm Serpent or Void Spinner”. Titan Powerfist is meant to say AND after the ranged attacks – it has to choose between the CC or FF boost, but gets these in addition to the shooting from it. You should remove the CC and FF from the SM Vampire Hunter, it was a mistake SG made on the reference (likely copy and pasted the Vampire stats and forgot to change them). It can't carry troops so isn't allowed to land or use them.
I dislike 4 strong War Walkers – please can we change back to a fixed 6 as in Swordwind and Epic-UK? I've played a 15 activation 3k Eldar army years ago that was a pain to play and allowing 4 strong War Walkers would have allowed an even higher activation count list to have been used. 6 strong War Walkers are a niche unit, but do see play and are fine.
Could we scrap the option of having a 6 strong Swords of Vaul formation please and return to the original fixed number of 5? Eldar are meant to be glass sledgehammers – deadly, but fragile. Having 6 makes the formation tougher to break and destroy and isn't needed.
Titans: I did some analysis of the Epic-UK Biel-tan lists all online on their site (they're way more organised than us and it's an excellent resource). 101 different Biel-tan lists have been fielded at their tournaments with a pretty balanced overall score of 38% wins, 35% losses and 27% draws. Of those 101 lists 26 took Warlock Titans and did considerably better than the Biel-tan average with 48% wins, 36% losses and 16% draws. Phantom Titans were only used by 6 of the 101 lists and they performed worse than the Biel-tan average with 38% wins, 46% losses and 15% draws. Going by the Epic-UK lists it looks like the Warlock is too good and the Phantom too weak.
Phantom – good call on the cost reduction and the TK2+ rather than TK3+. Phantoms are meant to be much more common than Warlocks whereas the opposite has been true in epic till now, hopefully this will change that. Phantoms are much more likely to be mobile now, appropriate for Eldar, rather than standing still to sustained fore.
Warlock Titans – they're a beast in assault and too good for their points. I'd probably leave their stats as is but bump their cost up by 50 to 900. Warlock based armies would still be viable and do well, but they'd have slightly less to spend on support formations.
I'd just do what Epic-UK did and split the Void Spinner off into a seperate entry and prevent it from taking other superheavies in it's formation. Do we really need the option to use 3 Void Spinners in a formation? 9BP Disrupt (on a skimmer that can't be clobbered easily by Terminators) could be a good formation for a bigger game.
Keep an eye on the Fire Prism, it used to be +15 over a Falcon but SG dropped it to free and it needs testing to see which is more appropriate.
Quote:
1) Swords of Vaul Troupe-" Up to one Falcon may be replaced with a Fire Storm for free".
Is this an actual change?? It's not in the army list pdf. I hope not and would very strongly advise against it. Falcons have always been able to take 2 Fire Storms and it works fine. It gives the Eldar good AA, but they need it with their fragility.
There are a couple of other things Epic-UK have done with their Eldar list that could be worth considering possibly trialing too (not sure what your opinion or others is on them):
Re-introducing Spirit Stones, but as a +25 point upgrade for vehicle formations (Falcons, Night Spinners, Engines of Vaul) that gives the formation leader, but is not tied to any particular model. This exact same thing is done in the Tau list with their Bonded Team upgrade, so there's Net-EA precedent too.
Represent Exarchs properly: give HB Exarches first strike, FD Exarches MW, SS Exarches Lance and Dire Avengers Exarch CC attack MW. From a background perspective you would expect them to have these and it would be characterful. Would it be overpowered or lead to people favouring some Exarches over others? I was a bit surprised when Epic-UK made the change and am not totally sure but cautiously like the idea myself. It might help to get the opinion of Epic-UK players on how these have been doing in their games.
Lastly Harlequins – I reckon it would be nice to add an option for these to Eldar lists generally. They regularly fought as part of Eldar armies in previous epic editions and old players with the Eldar War Host box will have epic Harlequins models but no use for them. Though not part of craftworlds as such they often fight alongside them as allies (just like titans aren't part of a SM list but often fight alongside them as allies) and they have been a unit option in the last few 40k Eldar codexes. I'd restrict them as they're rare and so as not to make it too big a change - have a single 0-1 formation of 4 (plus optional Venom transports – a transport variant of a Vyper carrying one stand), coming out of the allied 1/3. Stats, costs, ect could be discussed and worked out but I would aim them be a nice option that adds something different but not a must have. They could be available to Eldar lists generally as allies (and Harlequins ally with the Dark Eldar in 40k too so could be added as allies there too eventually should they work out here and the DE AC wish to).