Just email Z-Man Games. While I can't vouch for Z-Man, most publishers are known to send you a promo if you let them know you pre-ordered the game.
Except ZMan. I've tried this in the past and it didn't work. Tried with this one as well and I was told that maybe they will make it available in the future - in short, no chance from them directly.
Now that ZMan is also owned by Asmodee, it makes things even more unclear.