As far as I know this game is Multiplat. But IGN have had extensive hands on with the 360 version of the game. I have to say this looks like it's shaping to be a must have title of 2009. Graphics are also shaping up very nicely as well.
IGN are very positive for the game:
"This cinematic influence is something that's carried through every aspect of the game, as Assault on Dark Athena shares the high-end production values of its predecessor. Fine voice work – B-movie stalwart Lance Henriksen and a more than capable cast join the baritone Vin Diesel – combines with excellent character models to create a pervasive atmosphere, and powering the dialogue is a hard-edged script with some extremely grim undertones. The Dark Athena is party to some truly depraved acts, whether that's an inmate masturbating in the corner of his cell, or another screaming rape threats at the top of his lungs."
"The inclusion of a retouched Escape from Butcher Bay could make the package indispensible. It's looking remarkably good following its facelift, and all of the new features of Assault on Dark Athena have been ported over, though we weren't able to test how well they've been implemented as our time with the prequel was eyes-on only. Combine the meaty single-player double punch with the as-yet undisclosed multiplayer, and it looks as if Chronicles of Riddick could be the first must have game of 2009."
Full article here:
http://uk.xbox360.ign.com/articles/943/943410p1.html


















