Apple has seeded tvOS 11.2.5 beta 3 and watchOS 4.2.2 beta 3 to developers for testing. The build numbers are 15K5544a and 15S5536a, respectively.
No new features are listed for either beta; however, both are expected to bring bug fixes and security improvements in the OS and SDK.
Developers can download tvOS 11.2.5 beta 3 and the watchOS configuration profile from the link below. Please follow iClarified on Twitter, Facebook, Google+, or RSS for updates.