Seems the developers at Facebook working on Facebook for iOS have been rather busy as of late. Just last month they released v7.0 that contained a few bug fixes but this time around they've jumped all the way to v8.0 that actually brings some notable changes for folks who like to share photos from albums in addition to an updated design for iPad users according to the change log that accompanied the update.
A simple way to see and choose a photo album's audience
An updated design that makes it easier to post and share on iPad
Improvements for reliability and speed
Looking through the history of the updates, it's a bit of an odd occurrence that they went from v7.0 directly to v8.0 but as long as the app really is improved, we're not going to make too much of it. Have you grabbed the update yet? If so, let us know how it's working for you.