I actually think this is good news. Choke will have a much better run and gain more exposure and word of mouth if it's not jampacked into the middle of one of the craziest tentpole movie blockbuster summers in recent history. With that, here is the lovely Samantha Bond, from the publicity department of Fox 2000:
JUST found out that the film is officially moving from August 1st to September 26th for its theatrical release. That date is official and ok to put on your site let fans know.
Oh, and you had asked about festival screenings. The following have been confirmed for CHOKE:
Los Angeles Film Festival: June 23rd and June 25th
CineVegas Film Festival, Las Vegas, NV: June 20th
Sundance @ BAM, Brooklyn, NY: screening on June 5th and June 7th, Q&A with Clark Gregg
Seattle Int'l Film Festival: June 5th and June 7th