Actually, it's not a new "King Kong" movie. It's supposed to be based on the old arcade game called "Rampage". I've played it before a long time ago. You are the monkey "George" and you have to knock down all the buildings in a city while avoiding be shot at by helicopters, and Army men, while rescuing the occasional "damsel in distress". There is not much to the game.
A friend and I spent almost a full night playing it to see if we could get to the end. We did! And it was pretty lame. All there was was a simple screen saying we had completed the game. It took like eight or so hours to do, so we were a bit miffed.
Here is a video I found on YouTube to show what the game was like.