A new polybag has been discovered called LEGO Jurassic World Gallimimus Trap (30320). This will be the only set that has Gallimimus. For now, this polybag set looks to be an exclusive Gamestop pre-order bonus for the LEGO Jurassic World video game according to the game’s official Twitter account.
This won’t be the only pre-order bonus. People that pre-order the game at Target can get a Dr. Wu miniifigure though he isn’t an exclusive minifigure. He’s also found in Indominus Rex Breakout (75919).