You guys in the U.S. and Canada can thank your lucky stars - UK viewers still haven't had the first airing of season 6 yet. It's supposed to be sometime next month on More4, which is a satellite/cable channel. Imagine if you're a terrestrial TV viewer, having to wait until the Region 1 DVD comes out before it's aired on terrestrial TV.
Still, I'm not complaining as I've seen all the episodes to date - I just feel sorry for the people here who haven't seen it and who are eager to find out what happens.