I wasn't expecting for this to be a day one purchase, but since my region of the country is snowed in right now, I picked it up through Steam. It's overall a pretty solid game. The visuals, soundtrack, and ambient sound design are all really good. I find the parkour seemless and smooth; some people have even compared it to the Mirror's Edge parkour. The melee fighting is good, but the zombies take insane amounts of damage. From what I've played so far, there seems like a ton of content. I'd recommend a purchase.
A word of warning, though. If you're going to get this on PC, make sure you have a state-of-the-art computer. My three year old gaming laptop is struggling with the game. It's probably because the game (like GTA V) takes place mainly on one huge open map. Loading times are short, but because of how massive the map is, looking at the distance can cause massive framerate stutter. If you're not sure about your specifications, definitely try it out on console.
Anyone else get the game yet?