Alright, time to look alive. Tickets go on sale globally tomorrow (Monday) - there is some ambiguity of the precise time, but the consensus seems to be 00:00 PST, 03:00 EST, 08:00 GMT/BST, 09:00 CET, and 10:00 EET but better check with your local theatre chain just to be sure.
Global premiere is supposed to be simultaneous as in precisely at the same hour and not just the day - Wednesday 16th December, 08:45 GMT according to my local theatre chain (or at least that is the time of the first showing they are selling tickets for and claim that this is mandated by LFL who have also banned any midnight preview showings before said time).
First and only full trailer is also imminent and will debut sometime during the ESPN Monday Night Handegg match starting at 20:15 EST on Monday / 01:15 GMT on Tuesday, and should hit the web shortly after that. (Some sources claimed that even ticket sales would begin only after this, but like I said, better safe than sorry.)