It’s a relatively light download at 159.29MB, and it brings with it the following changes:
Improved fingerprint recognition process
New feature in Photo Editor (no word yet on what this new feature is)
Improved compatibility with accessories
Enhanced user interface for Email, Music, S Planner and other apps
As always, you can expect this thing to roll out in stages, with unlocked devices likely getting the first swing at the new goods. Carrier variants are subject to testing and certification, so it may be a while yet before you’re able to pull it down.