From Sherdog:

"We were renegotiating. I think we’re pretty much at the end of that road," said Kogan. "After the CBS show, we thought that the terms needed a little bit tweaking -- nothing major, just a little bit of tweaking. So, we had a round of negotiations with Strikeforce. Everything went positively. We’re pretty much at the end." 

"Obviously, we are much more than the management company for Fedor," said Kogan. "For us, it’s really important that the M-1 Global brand is acknowledged on these co-promotion events. As much as the partners made a lot of effort to acknowledge the co-branding, the media basically picked up on the fact that it was Strikeforce and kind of forgot about everything else, which wasn’t the most ideal for us."

"I think June, July is realistic (for Emelianenko’s return)," said Evgeni Kogan, M-1 Global’s Director of Operations. "It’s not 100 percent. Don’t take this as a fight announcement, but I think during the summer."

So it seems as though M-1 felt as though their brand wasn't promoted enough during the initial CBS broadcast.  However, if it is indeed a co-promotion, what part did M-1 play in that besides putting their logo out there and supplying Fedor Emelianenko?  What did they want re-negotiated?  More logos on the cage, more money, or more name drops on the broadcast or something?