Possible Spoiler?
During the mini break in Season 2 (between the last few episodes) there was a a quick advert for season 3 and it had Mike hooked up to a polygraph with Louis screaming at him "did you go to Harvard?" so I'm guessing that the Mike/Louis break-up will push him into being the original jerk he was at the start and he'll concentrate on destroying Mike for going back to Harvey after saying he'd stay with Louis.