@frogbear: They don't replace Chapters. Carcharodons is only the new name for the Space Sharks.
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Well yes the word "suggestion" is pretty much all of what it is. It only suggests Raven Guard as the Carcharodon geneseed that the Inquisition recovers has Genetic markers of similar points to that of the Ravens. There is no definitive answer to which they come from but their skin is pale white and the older the Marine gets the more black their Iris becomes eventually subsuming the pupil as well. Theres nothing to confirm that they are the monsters from the Raven Guard, it just suggests... Also they apparently don't play nice with others either. I'm not sure if any of you have read any of the other Imperial Armour books but when they do Space Marine profile pictures usually it says something like:
Brother Argentum, 19 confirmed kills, cited for marksmanship honour
With the Carcharodons (Interestingly a megalithic shark not Greek) their profile say
Unknown battle brother: Pict image captured
Oh one last thing about them the Chapter Master Character? he allows Bolters to be replaced with CCW's
Also The Sons of Medusa special character is a Master of the forge type with a Mephiston esque statline. This is due to all of the bionics he has modified himself with over the years becoming a Giant-Freaking-Cyborg with a servo harness and some other gubbins. I'm surprised more people haven't picked up on the fact that he grants Devastator marines feel no pain for free so long as their suitably bionicy looking as being the travesty of cheese opposed to whether the Carchardons are Raven Guard sucessors or not.
I did also get a look at the Executioners who happen to be an Imperial fists successor if my memory serves. They have a barabarian look about them to deliberately mislead their foes. Their led mainly by their Chaplains who are essentially tallyman, your going to have to forgive me if I get this wrong I was more bothered by the Carcharodons at this point due to the general coolness of them. they should be getting a Reclusiarch and a Chapter master Character.
The book itself has Huron on the front of it, in his Terminator armour and should be coming in a slip case like the Vraks book with an Inquisitional sealed report look about it. Theres going to be some Battlefleet gothic stuff as well to represent the Badab system space war, which is nice to see. Some very cool looking technical specs on Power armour as well.
Further more I had a nice long long chat with the Forgeworld boys and they love just taking a small but incredibly deep slice of the 40k fluff cake, I mean just look at the raid on Kastorel-Novem, cookie if anyone can find that fluff reference (Hint: Its in the BRB). I was speaking to the Author of the books Alan Bligh and he has done a hell of a lot of research into the Badab war and everything in it is taken from canonical sources including the renaming of the Space Sharks to the Carcharodons. The Forgeworld boys also want to do some Mk8 and Mk7 (Yeah, I know you get it as plastic...)power armour further down the line to complete off the set of armour as well