The release date was confirmed for the 25th, however, it's not available anywhere and the o'reilly page now says:
Pre-Order Print: $49.99
March 2013 (est.)
Is there now a new release date for March? If so, someone needs to update amazon.com.
Yes, the March release date has been updated to March of this year, though keep in mind it's an estimated date. This particular book has had it's release date pushed back a few times for editorial reasons so that date isn't set in stone at this time.
I'll ask our editors to get the Amazon date updated.
Customer Service Rep,