Well, we've ALMOST got a confirmation on the date of the London premiere of Mockingjay Part 1. ODEON Cinemas have been tweeting back and forth with fans, and they've confirmed the premiere date as November 11th at Odeon Leicester Square. Then they sort of back-peddled and said that it hasn't been totally confirmed as yet. We're pretty sure we can count on this as the date but we'll keep you posted if we hear any changes.
And thanks to @perfectjlaww and our friends at QuarterQuell.org for getting the info from Odeon!