Last night, something very interesting came our way. Something massive — documents and images outlining what appears to be a new Facebook iPhone app built around photo sharing. We teased what we had with a single image last night. Now, as promised, here's the rest. A few notes: the images we have suggest that while polished, this still may be a work in progress. It's clear that some of these mock-ups are older than other ones, given a few documents we have as well. Also, some images make it seem as if the service will eventually reside within the existing Facebook iPhone app, while others seem to showcase an entirely new app (or a completely redesigned Facebook app). It's entirely possible that both will be correct. It would make a lot of sense for Facebook, which is by far the largest photo service on the Internet with close to 100 billion photos, to make their own dedicated photo app. The space is exploding with popularity right now as Instagram and others are gaining millions of users quickly. Regardless, Facebook's focus on mobile photos going forward is very clear.