Apparently BBC America have aired a trailer saying that Season 7 will start on 8th September. I'm hoping that BBC 1 will start the week before still though, as it's Memorial Weekend (?) then I've been told.
Well...— Doctor Who Online (@DrWhoOnline) August 20, 2012
@bbcamerica have now officially confirmed they will air 7.1: Asylum of the Daleks on 8th September...UK is now either 1st / 8th.