The Suits in the know have determined that no new contracts will be given to Dark Horse after the current ones expire. So all new projects after 2013 will be handled internally by Marvel.
It’s not known yet if titles will be worked into the regular line up, or will Marvel create a special branch of the company that deals with Star Wars. It’ll take a couple of years for the old deals to work there course, but the stories that Dark Horse have coming down the pipeline will be the last. And you can expect anything new from Marvel dealing with Star Wars to arrive around 2015.