Amazon (US) have had the X1 and various release date games down with a release date of 27th November for a few days at least - click
Target.com (also US) quotes everything with release date of 27th as well - see Forza5
has everything listed with 8th release date.
So, two US sites say 27th, and one UK site I can see says 8th. Therefore, they must both be right, and MS has decided that as us in the EU aren't getting a load of the TV stuff, they'll release early in Europe and make the Americans wait! Huzzah!