Yeah, he's definitely about to pull a Frieza at some point. I mean, they can't really have the series ended by a character that they introduced only like 100(or so) chapters ago defeating the main baddie that's been around since the beginning, can they?
Either way, I'm still more interested to see what they do with 1. Aizen, 2. Grimmjow, and 3. Ukitake(in regards to his possible bankai reveal...?).