Here's the list:
And here's a trailer for all of these:
Interestingly enough, they also went and included a "comfort" category to ensure that ensure that players know what to expect when it comes to motion sickness. You can also check out the price of each game.
Some are surprising, like The Vanishing of Ethan Carter which could be absolutely gorgeous in VR but should require quite a powerful PC.
They also unveiled the Rift's home screen and it looks sleek:
HTC is next and should provide a list soon, ahead of the Vive's April 5th launch.