The US division of Capcom has confirmed that Xbox Live exclusive title, Dead Rising 2: Case West, will be releasing in December. Although they didn't specify a date.
The game, which is another epilogue to Dead Rising 2, will allow you to take on the role of Dead Rising's original protagonist, Frank West. But Chuck Greene will be in there too so you can indulge in some co-op action.
It'll be interesting to see if Case West is able to do as well as Case Zero, which has sold over 600k units on Xbox Live.