It appears that UFC featherweight champion Jose Aldo will be defending his title in Canada, not Brazil. And the opponent will be Erik Koch. The bout will serve as the main event of UFC 149 on July 21st in Calgary, Alberta, according to multiple sources.
Aldo was originally expected to fight at UFC 149, and Dana White announced as much when they held a press conference in Calgary about a month ago. But when the company had troubles finding a venue for UFC 147 and the Anderson Silva vs. Chael Sonnen bout was moved to UFC 148, White said that Aldo would "probably" be fighting at UFC 147 instead. That will not be the case now, which was confirmed by Brazilian site Globo late last night. Apparently Aldo said he wouldn't be ready in time for a late-June bout.
The Globo article doesn't mention an opponent for Aldo, but other sources have confirmed it will be Koch, and it will be the headliner. This apparently means that the UFC light heavyweight title bout between Jon Jones and Dan Henderson will not take place in Calgary, but who knows at this point.