1/19/2011
I just got my copies and they look great. Amazon shows Jan. 21 and Barnes and Nobile shows Jan. 27. But if you want to get one from their first shipments I would imagine it is important to preorder now.
The new book has a blue cover and weighs in at just over 550 pages with the three new chapters and 9 new games. I've switched the pages on the site so they now show the source files for the second edition, though you can still get to the first edition's source too.