Taking a quick look at the spec table, not much else has changed with the new Surface Keyboard. It's still only Bluetooth 4.0 LE compatible, rated for 12 months of battery on two AA batteries ...

This keyboard is only compatible with Surface ... 5-7 seconds until the LED light flashes white to turn on Bluetooth pairing mode. Select Surface Slim Pen to pair your pen.

The Surface Pro Flex Keyboard is designed with maximum comfort in mind. To that end, you can detach it from your Surface Pro while remaining connected via Bluetooth. There is also a wide touchpad ...