I have mixed feelings.
The idea of an open world zombie game with crafting, survival, and CoOp to it sounds really cool. The melee also looks fantastic.
However after watching the video some crucial areas come to mind. The animation for the player doesn't match the quality of the animations for the zombies, it looks cheesy and yeah like others have said, Jurassic Park: Trespasser. The truck bugs me... it doesn't match the art quality of the other "crashed" vehicles, also is this going to be the only drivable vehicle? If it is will it be craftable to improve it into a zombie killing machine? The floaty damage numbers and names over everything also put me off. What's the point of building an immersive virtual world if you take people out of it by that? I hate it when MMOs do it and FPS games should never do it. Also the scope of the project calls a lot of doubt into question.
I hope they have time to improve the problem areas. I think the zombie genre will be better for this game doing well.
I'd still like a Left4Dead sequel that incorporated building elements ala Garry's Mod.