UPDATE!
-Added MARS to the "To be Announced List"

Im not sure mars is exclusive, in the game's news section there is a preview in the official xbox mag

http://mars.spiders-games.com/news/509

At the moment the site still says PS3/PC exclusive(even having a mock PS3 case for the game under it. Yes, Xbox mag did preview it which makes it very confusing. We will not know for sure if this game is exclusive till it is unveiled formally with a publisher. Until that time though, its down as PS3/PC.

I think they allow any and every publication to preview them because it allows more coverage(they are shopping for a publisher remember) we know their standing on publisher wanting a 360 port, but say if SONY decides to pick them up it will most definitely be exclusive. Sony also has that whole deal with creating exclusive games for them and giving them reign over the IP(They will cover ALL developement costs).

Add Trinity universe (it will be out in summer) and Tales of Vesperia in "maybe".