I'm really not surprised by this news, it appears to be Capcom's new strategy in this expensive high definition generation to go multiplatform/neutrali. DMC4 should do well on the 360 here in North America, but I don't see anything other than Final Fantasy being 360 exclusive helping sales over in Japan. And, hey, bring on the Lost Planet PS3 port!
In any event, Sony REALLY needs to think about dropping the price of the PS3, or they're screwed in North America.