No idea how reliable this info is at all, so take it with a very large grain, or maybe a whole shaker, of salt, but... several people on the Apple discussion forums are saying that customer service reps have told them the update will be in the beginning of February.
http://discussions.apple.com/thread.jspa?threadID=1356425&tstart=0
Apple customer service and retail reps do not know about "open" release dates on things like software updates that are distributed centrally and online. Even with product releases the retail people have told me before that they know no more than we do until the day of release, and that often includes the actual date it's supposed to be released.
That being said, this doesn't mean it'll be today. It doesn't mean it'll be tomorrow, or the day after, or the day after. It just means we don't know, customer service doesn't know, and Apple won't say with certainty.
In fact, I'd rather they don't... because to project an exact date for a software upgrade is setting an expectation that may not be met. It's better to not set an expectation, or to set a low expectation and exceed it, than to set a risky expectation and fail to meet it.
Products with pricetags are a bit different because sales forecasts depend on deadlines being met... and in the case of stuff like iPhone there are other business partners (AT&T) whose sales projections depend on agreements made by the hardware supplier to meet certain deadlines.
Thing I've learned is that it doesn't pay to be holding one's breath. It's an update...it'll come. Don't get all bent out of shape.
TV update was released on a Wednesday
