I would not be surprised if the plot of Jurassic Park: The Game was used for the fourth film, but I find that it would just screw over the established canon. Currently, JP: The Game is considered canon by most fans, and we'll have to wait for this film to know if it will still be canon.
The plot for JP: The Game was actually very good for the JP franchise. The game, although I haven't played it, had bad gameplay, but it's story and voice acting is what most people have been talking about. Not to mention it seemed that they created the right atmosphere of the first film. I'd call the game a fourth film within itself, and I hope the Spielberg looks at if for ideas of the new film.
But, from the looks of things, I think they have a story. We can only hope its a good one. Better than JP3, at least.