The way , how Aizen behaved , rather very calm about he being sentenced for prisonment for 18k+ years.
I think , that we might see Aizen again , fighting against the Vanderreich or something.
I dont think , that Tite would kill off or ignore chuch a well developed character.
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It's highly likely , that he had a Plan B.
And Aizen is most likely one of the reasons , why the Sternritters are in Soul Society.
I think , that they need Hogyoku for something.
I think , that they want to destroy the hogyoku in order to bring Soul Society into Oblivion.
Fighting the Captains and Shinigami is just a diversion , while "some one" in the shadows is pulling the strings and will release Aizen.
Since Aizen is truly Immortal = He can stay there even for millions of years.
But it's Debatable I think.
Any Opinions on this?