I remember hearing it went to RTM, but yeah this has to be one of the quietest retail releases ever. Personally, Office 2000 is still doing fine for me at home, so I don't see any reason to upgrade. I imagine that's one of the big reasons 2010 hasn't been selling well.
Office 2007 is the only version of Office I can say was at least a bit exciting because of how much it had changed (for the better in my opinion) and MS Office is still the best office suite out there no matter how many people try and copy it but yeah, Office 2010 really doesn't seem like it's worthy of any kind of hype.
It's just not one of those things people run out and get on the first day