Why would you want to play as the human? They better make the human more entertainable to play as then the alien and the predator.
Also it looks like Doom 3
You do know this is based off of a series of games that predated Doom 3, and even inspired some of Doom 3's mechanics such as light deprived corridors with enemies that jump out at you and a flashlight that you end up trying to use ALL the time.
In this game, as well as the previous games they are balancing the Human, the Aliens and the Predators out. Humans have high powered weaponry and can hit extremely hard. With a tactical style your used to in FPS games. Aliens are the fastest and can crawl on walls, and Predators can cloak and use stealth tactics.
Similar to one of those Half Life mods that put you in the perspective of a Xen warrior. Each perspective also has a different suvival factor. Humans can heal themselves by finding health packs, Predators can only heal by killing enough people which gives them energy, and allows them to use more of their arsenal consequently. The Aliens are more suited to hit and run tactics and can only heal by mutilating a corpse.
The Marine campaign is set to be far more horror style as you try and prevent both Zenomorphs from swarming you, and the odd Predator sneaking up behind you. The Predator campaign will be stealth gameplay at it's finest and the Alien campaign will revolve around survival.