I guess I'd rather they avoid posting a date altogether. It sure beats posting a date and then missing it, and then posting another and missing that, etc. I think I prefer this vague sense of anticipation over repeated crushing disappointment.
I have no source, just if they want to meet the Q1 release (which they've stated they're sticking to), then an announcement sometime next month is logical. They probably already have the discs printed, and are now readying a day 0 patch for all the content they've mentioned recently here:
Ooh, I like the sound of those changes. I guess I might have a different opinion if I had actually gotten into the beta, though. Would anyone who has played care to share their thoughts?