So says Sports Illustrated:

"Their lawyer is looking at a draft of what we're doing," [Strikeforce CEO Scott]Coker said, "but I think we're pretty much done." He declined to provide specifics of the pending deal.

Roger is the latest Gracie to impact combat sports, winning at the 2005 ADCC competition by submitting every opponent, an unprecedented accomplishment.  In MMA, he is 2-0, beating Ron Waterman and Yuki Kondo.  He is still (presumably) very raw in his overall game, having last competed almost a full year ago, but he is obviously very skilled and could make a serious impact on the heavyweight division.  Stikeforce also has Brett Rogers, and those two could have a compelling striker-vs.-grappler match, and giving each other a real test of skill (certainly more so than their other opponents).  Fabricio Werdum, too, is most likely signing with Strikeforce, giving another interesting matchup.  He weighs only 220 lbs, so he might even be able to cut to LHW (I'm not sure if he can, but other fighters do, so it is possible).  There are many more-than-compotent fighters available to Gracie in Strikeforce.  It's a good signing if it's true.