Depending on the platform, the patch is about 3 GB. The patch addresses several bugs discovered during the Big Alpha and Open Beta, balances Monsters and Hunters, and adds connectivity to the released Evolve mobile game.
“We’ve updated or outright replaced the assets that were already in the game,” Turtle Rock said. “All you need to do to unlock them: EARN THEM.”
They also changed the Elite Skins, which you can see here.
For the complete list of what’s included in the day-one patch, take a look here.
For more about Evolve, take a look here.