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What I was wondering is it possible they might release a larger capacity iPod touch quietly with little to no fanfare?

Nope, if they release a Touch 6, it might have a larger capacity but it would be a major upgrade and Apple would not release it quietly :D.

I have been saying the Touch 6 will probably be out in the spring 2015 but, If you don't see it by July 2015, it's not happening.
 
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