Glenn Howerton (creator, writer, executive producer and Dennis Reynolds on the show) just confirmed they wrapped up season 7 of It's Always Sunny in Philadelphia 4 hours ago. Season 7 (13 episodes) will premiere on Thursday, September 15th (or 22nd, it's not definitive yet but it's one of those two) at 10pm on FX.
And for the lucky ones who can get to Comic-Con from July 21st to July 24th at San Diego, the cast and crew of It's Always Sunny in Philadelphia will be there and will be showing an exclusive episode of the 7th season to their panel, a "really sick" episode according to Glenn Howerton.
As for Glenn Howerton answering our questions... let's just say Dennis seems to have taken over :
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