Tyranid and Tau - These are, obviously, pretty speculative at the moment.  In fact, the Tau was just a hurried first draft and may end up radically different.
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TYRANIDS
Hive Mind:
Lucky - as Imperial
Marksman - as Imperial
Lightning Reflexes - as Imperial
Animal Cunning ? reroll failed activation
Warp-sight - 30cm MW4+ and Small Arms, MW 
Improved Hive-mind Nexus - Hive mind improvements survive on 2+
Bio-engineering: 
Improved Regeneration - [effects pending stats, similar to Damage control]
Fast - as Imperial
Heavy Carapace - +1DC
Turbo-Weapon - as Imperial 
Endo-Skeleton ? Invulnerable Save
Symbiotic Hive Tyrant ? Counts as Synapse Creature
Spore Cysts/Spine Banks ? Gains +1 Small Arms attack per 3 DC, rounded up
Spawning Cysts ? Adds +1d6 when Spawning
TAU
Crew Skills: 
Damage Control ? 

Lucky - reroll one die per battle (may be taken more than once)
Marksmanship - one weapon system causes critical hit on 5+ instead of 6
Accurate - one weapon system gets +1 to hit 
Fast - +5 cm additional movement, WE may countercharge 10cm when assaulted
Commander Skills: 
Damage Limitation ? Invulnerable save
Legend ? WE gains Tau Command ability
Lightning Reflexes ? [need new name and parallel effect]
Tactical Genius ? may reroll failed activation roll
Ethereal Commander 

 ? Inspiring
War Engine Upgrades: 
Heavy Armor - +1 DC
Ejection Pods - Crew survives WE destruction on 2+
Turbo Weapon - One system may fire twice while on Overwatch or during Sustained Fire action. 
Extra Shielding - 
