Like CGi said, 3rd party will be multiplat and the 1st party exclusive. People argue that 360 don't sell rpg, but there's already a good base for the genre in the system, and ps3 still stronger in Japan and have nice base worldwide. Well, it's a better discussion the real proportion of sales on each system. I think japanese sales for average JRPG will be something like 80% PS3 and 20% 360.
For worldwide we could see 60%PS3 and 40%360.







