The UFC can't carry 9 divisions, I'm not even sold that they will be able to keep the 135lb.
Good thing they won't. Strikeforce and the UFC will be separate entities. This won't be like the Pride deal because the office structure is already in place at Strikeforce. Also, Zuffa won't be dealing with the mafia in an attempt to even keep a foothold.
Strikeforce will be Strikeforce, the UFC will be the UFC. Changing of owners does not equal changing of all staff. I just foresee a lot of fighters released from the UFC going to Strikeforce and a lot of fighters in Strikeforce being promoted to the UFC. The UFC will be come the elite organization while Strikeforce will be like the development league.