Just notice, on Checkout it said "Pay at least $1 to be eligible to receive keys for this game (Steam, Desura, GOG) as they become available!"
So, where is Desura key again, lol?
You'll get a Steam key if/when the game is greenlit. I've already explained why there won't be any Desura keys this time. Sorry.
There's no Desura keys because unfortunately that would end up giving you another activation code. So if they offered Desura keys, everyone who bought it here would be getting two accounts for the price of one.