What we don't know is if it can output enough power to charge up other accessories.
There's really no good reason why the 12-megapixel back camera and the 5-megapixel selfie camera on the i Phone 6S and 6S Plus aren't on the i Pad Pro. Without going down the nerd rabbit hole too much, the more RAM a device has, the faster the data can be retrieved, and thus the smoother the experience will feel; you can open more apps, usually experience fewer crashes and run more processor and graphics-intensive apps (like editing video clips) quicker.
Historically, Apple has saddled its i OS devices with very little RAM.
It would be pretty neat to be able to charge up future Fitbits or other fitness trackers with a Lightning connector.
Apple didn't outright declare Bluetooth keyboards unwelcome on the i Pad Pro, but it might as well have.