Last week it was noted that Antonio Rodrigo Nogueira would be able to avoid surgery on the broken arm he suffered at the hands of Frank Mir at UFC 140. Well, that went out the window and Big Nog did indeed have to go under the knife according to Tatame:

But it seems like the plans have changed. Rodrigo was operated last Friday (16th) at Vail, Colorado, and the surgery was a success. The doctors say he might return to training in June. Rodrigo went to Vail and went through new tests, which pointed out the need of the surgery. His biceps wasn’t touched during the process. The "entrance" was made on the triceps, what means he won’t lose strength on this very arm.

If he can't even train until June, it's unlikely that he'll be seen in the octagon before September or October. That's a huge blow to a guy that is probably winding down his career.