According to the bundle page, people which will buy this bundle early are going to receive a FREE bonus game. There is a limited quantity of the free games.
Pay $2.99 (before price increase) for 11 Steam games - 9 have Steam Achievements!
Get 6 Steam games, 7 music albums, 2 comics, and Jacky Coin for $3.00.
Pay $3.99 (before price increase) for 10 Steam games dedicated to Virtual Reality Headsets!