For any members out there who are at all curious about Facebook Home, there is already a leaked ROM available for download of the new app/launcher hybrid. At the moment it is buggy and missing features like "Chat heads." If you just want to play around with it beforehand check out the source link below for a download. Be sure to read the disclaimers because it looks like there are some caveats to experimenting with it. Here's a quote with some of the details,

The build itself (pulled from a pre-release HTC First ROM) seems to be rather buggy and incomplete (I can't get 'Chat Heads' working for example), but it's interesting to have a play with to see what Facebook has in store for us later this week.

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
Source: MoDaCo