Today's new build is the first supporting the ability to run native Bash on Ubuntu on Windows. To do this, testers need to turn on Developer Mode via Settings/Update & Security/For developers, and then enabling the Windows Subsystem for Linux beta.
Build 14316 also adds new functionality enabling Cortana to stay connected and in sync across devices. This works across Windows 10 and Windows Phone and Android phones running Cortana Version 1.5 or higher. Cortana now notifies users of low battery power on their mobile devices, and can also locate phones using Find my phone/Ring my phone. With this build, testers also can use Cortana to can access navigation details across devices.
Those testing 14316 also can try out the recently announced Skype Universal Windows Platform preview app. Additionally, testers now can select which app notifications are most important in Action Center and toggle between light and dark modes. And using the new Connect app, testers can bring Continuum to the PC from their Continuum-enabled Windows 10 phones without using docks or a Miracast adapter. PCs can now project o other PCs via Continuum with this build as well.
There are a few other features, such as an updated battery settings, more detailed update progress and the ability to pin a window so it's available on every desktop, in the latest test build.