Okay, but Facebook isn't really going head-to-head with everyone else shipping the stock version of Android with a slightly different coat of paint, so I don't think it's a huge deal if they're a few months behind.

Also, while there have been some performance optimizations in the latest builds of Android, from a feature perspective there hasn't been that much (NFC is the biggest one in Gingerbread). So even working on the previous release doesn't seem like a huge deal to me.