Facebook's speedy slideshow photo viewer

Check out this screenshot of Facebook's new slideshow photo viewer:

There is a popup black modal that the photo sits on.

It's also super fast. Arrowing through a slideshow is like flipping through a book, and there are no pages that have a spinning wait symbol anymore.

Photos is probably the most used app. I wish they would have just built this functionality into the regular design of the site. Do you have the new photo viewer?