The new games include Savant: Ascent, Syder Arcade, and The Shivah. For those unfamiliar, Humble Bundle allows users to pay one low price, split between developers and charity, for a - for lack of a better term - bundle of great titles. Those who pay more than the average payment can unlock additional titles as well.
Savant - Ascent follows the story of a "mechanical wizard" looking to gain the power of a mysterious orb that has inconveniently turned pretty much everything into bad guys that you'll need to dispatch with as quickly as possible as you ascend a tall tower.
Studio Evil's Syder Arcade is a fast-paced bullet hell style game in which players will blast aliens and assorted spacecraft in "an uncompromised old-school experience."
Finally, the Shivah is a story about a Rabbi who's grown cynical and is considering "packing it all in," when he receives a substantial inheritance. Unable to simply take the money and move on, the Rabbi travels through Manhattan to unravel a plot full of "unknown dangers" and "sinister rivals."
Bought separately, the games cost well over Humble Bundle's current average purchase of $3.87, which you'll need to top in order to get the new games.