Ryan Murphy tweeted, “So exciting… Season Four, here we come!” along with a link to a promo for “Glee” on Wednesday, giving fans of the show a chance to see exactly what’s new and different this year. The answer is, of course, almost everything. Sue (Jane Lynch) has had her baby, and she’s working with Will (Matthew Morrison) to keep New Directions on track. Kurt (Chris Colfer) brings “The Glee Project”‘s Alex Newell to the choir room, and Rachel (Lea Michele) faces off with her NYADA instructor Kate Hudson. But watch for yourself — and remember to set your DVRs for “Glee”‘s return on Thurs. Sept. 13, 9:00 p.m. on Fox.