Forgive me if this is old news. I stumbled across this item completely by accident.
http://www.gamesdomain.com/playstation2/previews/A_Sound_of_Thunder.html

The article is undated (one of my pet internet peeves) so it's hard to tell if this is recent stuff or if the game has long since been forgotten.

I would speculate that this game is being prepared for release in conjunction with the movie, so for those wondering how Ray's short story would expand into a two-hour action/adventure, this might be a clue.

More info, in interview form. Apparently the game is independent from the upcoming movie.
http://www.homelanfed.com/index.php?id=10914