Following with
the public releases of iOS 10.2 final for iPhone, iPad and iPod touch, Apple
seeded iOS 10.2.1 Beta 1 with a build no. 14D10 to developer testers along with
beta 1 release of macOS Sierra 10.12.2, watchOS
3.1.1 and tvOS 10.1. that comes with minor changes, bugs fixes and
other improvements. 
iOS 10.2 introduces new features including the TV app (US Only), a new and unified experience for accessing your TV shows and movies across multiple video apps. Emoji have been beautifully redesigned to reveal even more detail and over 100 new emoji have been added including new faces, food, animals, sports, and professions. This update also includes stability improvements and bug fixes.

iOS 10.2.1 Beta 1 is available for download to registered developer’s via OTA over-the-air on iPhone 7- 7 Plus and other compatible devices

iOS 10.2.1 Beta 1 is available for download to registered developer’s via OTA over-the-air on iPhone 7- 7 Plus and other compatible devices like iPhone 6s-Plus, iPhone 6 – Plus-, iPhone 5-5C-5S-SE and can download iOS 10.2.1 Beta 1 through Apple’s online developer center and Apple Beta Software Program.
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