Richard Morgan has let us know on the Westeros.org forum about the current status of The Dark Commands, the follow-up to 2008's The Steel Remains. Bantam US had put the book in their Fall 2010 catalogue despite the UK publishers, Gollancz, pushing the book's release date back to 2011. Morgan clarified the situation for us, explaining that it has taken some time for The Dark Commands to come together as a book and his time to work on it has been reduced by a new gig advising Electronic Arts on some of their forthcoming games.
The good news is that The Dark Commands will be fairly substantial in size (the first book was about 350 pages in hardcover, so at half again in size the follow-up should be in the 500-page margin), but the bad news is that it might not appear for a while.
The cover above is the American one. The UK cover, without title, can be seen here.