It looks like!
There are reports on the OTN APEX forum that they have received a mail from Amazon that they have shipped the book. I also checked the order page of Amazon and it shows that the book is on stock.
I had the privilege to read one of the chapters one year ago and if the rest of the book has the same quality, then it’s a must read for every Oracle APEX developer!
BTW, I’m pretty sure John will sign it if you bring it to OOW – John, the new superstar! Maybe he even has to do an ad hock live session where he reads from his book