The injury bug has apparently struck the UFC yet again, this time it was UFC featherweight champion Jose Aldo. Rather than find a new opponent for Koch, the UFC has instead shifted one of its two title bouts from UFC 148 to UFC 149. Urijah Faber will now face Renan Barao for the interim bantamweight bout two weeks later than planned in Calgary, Alberta.
Source: http://mmafrenzy.com/28977/ufc-149-update-aldo-injured-barao-vs-faber-shifted-from-ufc-148/