Versus XIII was supposed to have more games to begin with, the whole "VERSUS Epic" tagline shows this. Tabata also confirms this when mentioning how they are making these things like the movie, anime, etc to put the story in those places instead of making multiple games.
The movie won't spoil you, the entire point of the movie is supposed to be that it's accessible for all audiences, so contextually it will be easy to get into, unlike Advent Children. On top of this, any connections with the main game will likely be towards the very beginning anyways.
Short answer, no... Why would they release a movie before the game and then spoil the game for you before it's even out, that makes no sense.