The second beta of iOS 10.1 has now been seeded to developers and public beta testers. We find this update three weeks after the first build. In this version we find the new Portrait mode on the iPhone 7 Plus, which uses the both cameras to give you a shallower depth of field. Other than that we’re not sure what’s new. It’s likely bug fixes.
To get the latest beta developers can download it in Settings. If you don’t have it yet you can download the profile from the Developer Center.