User blog comment:Godisme/Deicide 16/@comment-1405841-20100801045754

I think FAR too many people are hoping to see Aizen's bankai...when there's no indication that we HAVE to see it in the first place before the story ends entirely. There are plenty of characters throughout the history of animes who have a hidden power that is never shown, because they're killed off before it's used and people just move on from there...I doubt, at any point, that Aizen will ever be showing his bankai unless he survives this and continues on his main baddie role. To which case, he may use it on Gin...or during the Ichigo fight (if it ever happens).

I just wouldn't put too much hope into seeing his bankai, as well as a few other Captains.