Tite Kobo said that in the next arc Aizen will appear again! aizenplz And many other things...So yes, Aizen is in this moment is jail. It is 100% sure If you want the side where is the interview tell me.
I doubt that its part of his plan, but he'll have a plan for escaping for sure... maybe he wasn't prepared for Ichigo and Urahara defeating him, but there are the zero guard and the spirit king himself who he would have had to defeat when he wants to be spirit king, so he has to have a plan for the case of failure.
I'm actually wondering if he's going to be slightly unvillainized and Ichigo will break him out.
(This is all spawning from the scene where Ichigo told Urahara that he wondered if Aizen himself wished in some small part to lose his powers, which was why the hokyouku finally turned away from him. Then Urahara has this funny look on his face - which manga characters usually do when they know something uber-special that we're not allowed to know about yet. Therefore it makes me think there's some overarching plot even larger. It will either set Aizen up as the supervillain or Ichigo will break him out because it turns out the King is really the evil one, or some random twist like that. That's my very vague theory anyhow.)
I know it's sadistic, but I like Aizen in jail and not being fed O.o Don't take me wrong, I adore him! Hmm... when I imagine his master plan had failed and now he's all locked up and helpless, it makes me go "awww X33"...
it was his plant to make urahara san secretly give the hougyoku to rukia,so that she could make him a shinigami,and then ichigo would be totally bad-assed and kick everybody's ass,and then like out of nowhere ichigo would win against him and ichigo then would lose his powers,so that he later on he could escape and do everything from scratch
All a part of the plan. I mean... COME ON. D8< It's madness against logic here. He was about to destroy all the Afterlife, was too powerful for anyone's good, and they Don't kill him outright?! His head should've been chopped off and doused in ethereal cement. That's if anyone there were using their brains, that is.
But, since I liked aizen, i'd bet he's manipulating things one last time to bide for time. Like anything can hold him down. XD;
AIZENNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN *fangirl mating call* xDDDD its so totally a part of his plan... he planned to be locked away for a specific 20 thousand years and fool everyone into believing that they're safe because its for "so long", when really hes using the time wisely to get sexi(ER!) and then he'll MAGNIFICENTLY BREAK FREEEEEE *queen starts playing "ive got to break free!"* after a few years and SURPRISE everyone because "you could not possibly have anticipated this" and then he will troll us all for several more arcs
Hmm... I really can't say, I hope he does get out because the Arrancar arc was just plain awesome. But in another way, I want the anime to end before the stolen badge arc, otherwise it would just drag out and get repetitive.