Via Blogtor Who:
Although speculation isn't what Blogtor Who is about, it would seem that the launch date for Doctor Who Series 6, Part 2 has been narrowed down considerably. Online retailers DVD.co.uk have stated its release will be Oct 10. This would mean that the latest start would be Sep 3. Two screenings of the first episode, Let's Kill Hitler, are taking place in the UK on Aug 15 and 26 - suggesting that Aug 27 as the more probable.
Thanks to Randon Who for the heads up