On Bleacher Report is said that mayweather announced he would fight twice in 2013, likely against Robert Guerrero and Canelo Alvarez on Mexican Independence Day. So maybe no fight with Martinez
I have no interest in the Guerrero fight, easy pickings for Mayweather, however Canelo Alvarez is dubbed the next Oscar De Lay Hoya, and is showing lot's of potential. But he's even bigger than Martinez so I don't know about that one.