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