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It's deffinately not Burt, as it is said this whole thing will happen in the regionals episode,
where as Mike O'Malley has said he is staying and is included in atleast 6 episode so far in series 3.
source - http://www.gleefan.com/mike-omalley-discusses-future-on-glee/
(Thank god! I also love him )
As for the whole storyline it's self, I'm really stumped, I have no idea what's going to happen.