Same game you saw last year.
The Gameplay is not improved in any aspect, both in multiplayer and singleplayer, and still suffers from a bad framerate with severe lag in multiplayer.
Campaign is completely rushed and the plot is abysmal. It's 7 hours long.
One of the new features is the zombie mode, brought back from World at war, but still, it's extremely repetitive and worthless.
There are many available DLCs but they're so ridiculously overpriced that they aren't worth checking out.
All in all, this game is extremely overhyped and just not worth getting, simply because there are so many better FPS's out there.