These screenshots were leaked earlier but we could notice one new feature revealed by these screenshots now. IF you check the third screenshot with “quick action buttons expanded” you can notice some thing called “Device Discovery”. Now, check the second screenshot that shows “Devices” in the settings. The Devices has “Bluetooth, Keyboard” under the description.
So, it seems the device discovery will be a quick action button enabling which will allow the Window Phone device running “Window 10” to connect to Bluetooth devices and even Keyboards. Though if we just focus on the “Keyboard”, one more keyboard support (USB) comes to mind. Will the USB OTG support will be there?
You can read all the Window 10 for Phones details from all the leaks and official changelog in one place here.