Justin
#mmNation
It's going to be multiplatform. It just says PS3 because they already have a group of people that works with the 360 well.
Which is why the Microsoft game development team 343 industries will be making future halo games.The broke away from Microsoft and signed a 10 year deal with activision so it only makes sense there next game will be multi-platform. Keep in mind though Microsoft still owns Halo.