iPad Pro will be able to update accessory firmware in upcoming OS revision
The Smart Connector in the iPad Pro which enables the tablet to connect and power various accessory keyboard cases will soon be able to serve as a conduit to update firmware in connected devices. This was discovered when a developer running iOS 9.3 beta version 2 received an alert that the firmware of his connected Logitech CREATE keyboard could be updated via the iPad Pro. This is a first for an iOS device although various accessories and peripherals are usually updated by connecting them to Macs.
Source: 9to5Mac