UFC have to sign Alvarez or put him in SF and then bring him accross when they eventually merge.
He is one of the best fighters on the planet, hands down.
Unfortunately, I've read that he has little interest in fighting for Zuffa, which is odd. He says that he wants to fight the best in the world, but that those people aren't in the UFC. Well they're certainly not in Bellator, either, so....
I'll try and dig up the article.