Capcom's Japanese website is stating the following regarding the once Xbox 360-exclusive Lost Planet 2:

"Xbox 360 ® version
Release date: winter plans
Price: TBA"

Bear in mind that at E3, Sony happily announced that the PS3 version would be coming out in 2010. This could give - as expected - Microsoft a brief period of exclusivity; with a launch in winter 2009 prior to an early winter 2010 for the PS3 version.