a ton of Android users in the world who would probably like having a quality Facebook app for their device. So, Facebook has been dogfooding Android, and has promised a native app for the platform.
The Photo Sync feature is being tested right now by some users with the newest version of the app, and may see wide release soon. The feature works the same as the Google+ app where every photo is automatically uploaded and stored in a private album for easy sharing or sorting from there. The syncing has a couple of extra options though. Whereas on Google+, photos are uploaded simply based on your connection settings, and are downgraded to 3MP, on Facebook syncing will take into account your battery level before syncing. And, photos that sync over mobile data are cut to about 100k to save your data plan, but there's no word on if WiFi syncing will be full quality or not.
To check if you're one of the lucky few with access to the feature, go to your Timeline on Facebook for Android, then tap Photos, and if there is a Sync button, that will let you test out the new option.
source: The Verge