I think they picked that date to completely sidestep the 'busy holiday' season. I'm sure they could of gotten it down a couple months sooner, but then they'd have to compete with all the AAA titles releasing in that window.
The problem is, you get a mountain of smaller titles releasing in the January-March window .... then you get next to nothing for 6 months ;)
I personally hope it does come Jan 23 since it's my birthday that would be an awesome way to spend it.I have the japanese DS ver. which is pretty cool in and of it's self but the PS3 ver. looks like it will look a lot better on my HD screen.