One of the big distributors, Alliance, has it listed as Temporarily Out of Stock. This means that they don't have any to send to retailers, but expect to get some in from CGL soon. (whether this means they didn't order any or CGL doesn't have any to send is completely unknown) If you ever want to check on the status of a book, presuming your FLGS uses Alliance as their wholesaler, you can go to:
http://www.alliance-games.com/publicaccess/ That's the public catalog for everything and I think it updates daily.
I'm not aware of a similar catalog for the public to access for any of the other distributors. Most of them require you to be a vendor to look at their stock.