Together with the fourth beta version of iOS TVOS 10 and 10, comes today, Apple also watchOS 3 Beta 4 for all registered developers. The new beta version can be downloaded through the Apple Watch app for your iPhone, to which they are attached watches. Update in General -> Software Update , but keep in mind that your Apple Watch should be charged at least 50%, to be connected to the charger and above must be within reach of the iPhone that could be done updates.
As with the above listed system, even in watchOS 3 Beta 4 We do not know what news brings. However, we can count on bug fixes, which brought the previous beta, and possibly with some changes, which are likely to include innovations that brought watchOS 3. About all we will of course inform you.
Apple also fourth beta version TVOS 10 for all registered developers. New TVOS 10 Beta 4 is designed only and only for Apple TV 4th generation. Developers can update the Apple TV that connects C-USB cable to your Mac or PC. After that, you can install the update through iTunes or Apple Configurator. But if you have already installed a profile, just again updated via OTA, ie directly in the System Settings TVOS.
As with iOS or watchOS nor in TVOS Beta 4 Apple did not show what news brings the second beta version, so we can do nothing other than look. The possible changes, we will of course inform you.