If you're looking to quickly transfer photos and videos from your camera's SD Card to the iPad Pro, then look no further than Apple's own Lightning to SD Card Camera Reader ($29.00) to handle the job. Apple explicitly states on its store page that the peripheral supports USB 3.0 transfer speeds on the iPad Pro.
Interestingly, the same cannot be said for Apple's Lightning to USB Camera Adapter, as that still only supports USB 2.0 transfer speeds. The Lightning to SD Card Camera Reader, which just launched and is available to ship in 3-5 business days from Apple's online store, appears to be the only accessory to support USB 3.0 transfer speeds on the iPad Pro at this time.