The movie is a retelling of the first game with slight alteratios. I'd rather play a new game.
Do we think that the movie tie-in game (the one we're all expecting, but hasn't actually been announced or even hinted at, now I come to think about it) would actually have to follow the plot of the movie?
For one, I'm not sure Insomniac would be interested in doing that, and secondly I'm not sure there's any real need to. So long as the game and the movie release around the same time and they're both called some variation of "Ratchet & Clank" I feel like the cross-promotion would work just as well.