Looool. Horrible:
We cant drive this part home enough: If you are planning to buy the game, but are skittish about pre-purchase, dont be. As soon as the clock strikes midnight on 2/10/15, the FREE Monster Expansion Pack bonus goes away and it will run you over$14.99 to buy Behemoth, the fourth Monster, and the Savage Goliath skin after the fact. Think of it as us buying the first round for you. As a thank you.
http://evolvegame.com/news/the-evolve-digital-versions-breakdown
Shit, I guess at least they're being transparent about it.