A bit in advance of the announcement, 9to5Google says that Facebook Home offers a fresh take on Android UI:
Facebook Home has been well leaked by now, thanks in part to Android Police, information from Techcrunch, and 9to5′s own Mark Gurman. What we haven’t seen yet are many indications of the visual highlights of the collaboration; what will these “Facebook phones” look like when you’re actually using one?
Looks nice for sure. Course, do people really love Facebook enough to buy a phone for it?