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?
Windows 10 Desktop comes with support for wide range of keyboards and underlying OS being the same, Window 10 for Phones may bring much better connectivity options than Window Phone 8.1.
You can read all the Window 10 for Phones details from all the leaks and official changelog in one place here.