From the announcement:
It's official - Deadzone has sold out at the Mantic webstore!
This pre-release edition of the game was released ahead of the February launch date, along with a few other items (which are still in stock), and following incredible demand it the warehouse has now run out of copies to ship!
The game will be back on the shelves in February, but won't include the limited edition metal Survivor miniature who was sculpted for the pre-release edition - however, if you pre-order the game before midnight on 31st December, you can still get one!
For full details, head to the Mantic webstore!