From the announcement:
Like it says in the title, God of Battles finally has a date set for its official release: the 1st of March 2013.
A handful of copies have snuck out already, and there’s even a review of the book online (though he hadn’t played the game when he wrote it). For most people, however, it’s been unavailable. But there’s not long to wait now.
To celebrate this momentous event, there will be an event at Foundry HQ on the 1st and 2nd of March. I’ll be there on both days to talk to anyone who will listen about GoB and run folk through the rules. Most of the demo armies seem to have gone walkabout with the change in management at Foundry last year, but I’m sure we’ll find something to use.