According to a new leak, the latest internal Windows 10 Mobile Redstone build includes a new audio routing option. Specifically, screenshots posted by leaker Roman at show that users will be able to manually designate whether they want audio routed to a Bluetooth device or Phone speaker.

Audio Routing Options

Also new is an option to automatically turn on the speaker when a user pulls the phone away from their ear, adding a bit of extra convenience by eliminating the need to fiddle around with the phone while taking a call.

It's unclear when updated builds with audio routing will make its way to Insiders, but the inclusion of the feature is a nice perk nonetheless.