In order to use the leak, you need an Android device with a maximum resolution of 1280x768 and the ability to completely uninstall your existing Facebook app. This is important, as the leaked APKs are re-signed and can't just be installed over the top of an existing installation. This will automatically exclude some devices which have Facebook installed in the base ROM. If you're on a Nexus device you're good! Even if you do have Facebook in ROM, provided you are rooted there are workarounds - i'll detail these in the comments. If you have any problems installing post below and i'll help if I can.
The leak consists of 3 APKs:
● The main Facebook app ('katana')
● The now-integrated-with-your-SMS Messenger app (orca)
● The Home / Launcher 'shell' app (home)
More details on Facebook Home can be found here. Bringing Facebook Home to iOS would require a partnership with Apple which at this point appears unlikely.
Read More [via Jonathon]