Facebook have just released a cool little library which has all the cool little animations that they are using in the Pages app.

Certainly worth a download and a play:

https://github.com/facebook/pop

There has been some really good releases from facebook recently, hats off to them.

I noticed that the animations are very similar to a tool I used a while back called canvas

https://github.com/CanvasPod/Canvas

Try them both, all pretty cool and give your app that special feel to it.