UFC to buy Strikeforce

[Captain America]

White told MMAFighting.com that Coker would remain in charge of Strikeforce and retain his staff of around 10 employees. The company would run separately from UFC and exhaust its contracts with Showtime television. The network has a deal with Strikeforce that runs through early 2012, sources said.

I've read that any fighter who signs now with either UFC or StrikeForce can fight for either promotion, and any current fighter will be able to switch promotions after their current contract ends and they resign a new deal.

[Nameless]

I didn't see that move come. Personally, I think that monopoles are never a good thing and owning Pride, UFC and Strikeforce is pretty much like a monopole in MMA. Now fighters have much lesser place to negociate a deal when their contract expires as it is all the same owners.
I also wonder: what will happen with guys like Overwem who are doing K1 shows in Japan too? Will they still be allowed, once his contract expires, to make such fights in K1 or they will be bound and tied to the league they did sign in?