Keep in mind this is a complete rewrite of libraries so that means you will have to rewrite your html5 page from the ground up. But if you need performance, it might be worth it. Right now its focused on 3D, but I think this can be useful for any non document display.
Check out the video below. This is going to be a coding effort we will want to watch in 2013.
Also check out this snippet from the Sept newsletter.
Developing in famo.us is similar to Bootstrap. In famo.us you start with an app layout and then mix and match any of the famo.us UI and UX components and widgets.
In our “hello world” app, you’ll build a replica of the Twitter iPad app using the famo.us Cards App Layout (the same app layout used by Spotify, Twitter, Facebook and many other apps), and applying famo.us UI and UX components and hooking those components into some example data. Once you get the hang of famo.us, you can select alternative app layouts, and modify it them as much as you like. In fact, you will eventually be able to create your own app layouts, components and themes, and share them with anyone or offer them in the famo.us marketplace as well. Our goal is to enable developers to work with all of the popular app layouts found in native apps, plus we intend to create many more together with our community. Each app layout will work on iOS and Android, both as a web app and inside a native app wrapper, and will have layouts that smoothly translate across phones, tablets and personal computers.