Apple has seeded watchOS 4.3 beta 4 to developers for testing. The build number is 15T5199f.
This beta version of watchOS 4.3 contains bug fixes and improvements.
For more information, visit: https://developer.apple.com/go/?id=watchos-4.3-sdk-rn
The watchOS 4.3 software update restores iPhone music control, introduces support for Nightstand mode in portrait orientation, and offers a new charge animation.
Developers can download the watchOS configuration profile from the link below. Please follow iClarified on Twitter, Facebook, Google+, or RSS for updates.