Not unexpected, Nolan wanted that since 2010:

"The director of The Dark Knight and Memento wants to turn his latest film, the $750 million grossing Inception, into a video game. Just don't expect it any time soon."

http://kotaku.com/5644018/christopher-nolan-wants-to-make-an-inception-video-game

because inception is a very recognizable franchise, so it's a really safe thing to invest a lot money and recourses on. It'll probably have good writing though.... If it's really going be a thing in the future. 

Guys this isn't going to be based of the movie, it's going to be seperate. We all know that games based of actual movies are the ones that are bad.

I guess. Those older games generally recreate the scenes of the movie in a very jarring way and remove and add unnecessary element to the story in a poor attempt fit it with context of the game. I won't mention anything about the abysmal gameplay. 

This is very true. Many movie/licence based games are just handed off to whoever will do it for the least cash, and thus they nearly always end up as turds.

Being a fan of the movie, this idea crossed my mind two or three times. But I've been thinking many alternatives for gameplay, but I just don't see it. The dream concept from the movie was to leave you limitless possibilities, and I don't know if this would work for a game. If they manage to make a gameplay that would work, I'd love to see it.

I remember the director of Inception saying how he wanted to make a video game.

Uhhhhh... I don't see it...

I'm having trouble imagining how Inception would work as a game, unless it's just using the dreams as a convenient way of justifying entering vastly different scenarios one after the other, while the game itself is a standard shooter.

Or worse (to me) it's just a Heavy Rain type game.

Sounds great. WB are fucking killing it these days.

One of the best studios around.