Season Four of Glee aired between September 13, 2012 and May 9, 2013.
On April 9, 2012, Fox renewed Glee for a fourth season. Ryan Murphy has confirmed that all regular cast members from the third season will be returning to the show for its fourth season, though "it doesn't mean everyone will be doing 22 episodes".
Season 2's premiere date has not even been released yet, we just know that it will air in September 2010. Season 3, which has been confirmed, will obviously likely air in Fall 2011. Although Season 4 has yet to be confirmed, based on the show's popularity it is probable, and I would guess it will air Fall 2012. Well due to the shows popularity there probably will be a season 4 but maybe because we all can admit things on glee are happening too fast and the creator has said he is planning to graduate the characters in season 3 so if they graduate maybe the show is gone but we have to wait and see.
If you look up Glee Wiki and type Season 4 it will tell you
They have not confirmed an exact date but season 4 has been confirmed.
There will be a season 4 which has recently been comfirmed. We are not sure if Santana will still be there, but Kurt, Rachel and Finn will. :)
All of the series regulars will be back, but no one else is confirmed yet.
Season 4 of Glee hasn't even premiered yet, so at the moment, no :P
Yes. Season 4 has been confirmed.
Season 4 airs on September 13th
Yes.
Yes
Season Four of Glee aired between September 13, 2012 and May 9, 2013.