Telltale Games, the company responsible for the upcoming Back to the Future game, are supposedly working on a future release based on the Jurassic Park license.
Word has it that the game will be realistic looking rather than comic and it'll be action based and not point and click like Telltale's previous games. The main characters seen in the movies will be absent (probably due to monetary reasons) but the game world will still be one that fans will recognise with vehicles and uniforms staying true to their original source material.
On the back of that news it was recently discovered that a filming schedule chalk board at Universal studios displayed "Jurassic Park 4" filming on four separate lots... The news was promptly denied by the studio as a "hoax", but seeing as the board is locked behind glass doors it could only have been a staff member working there that could have done it and it all sounds like a swift cover up for something we're not supposed to know about just yet!