Clove Blog will have my video proof up in a couple of hours.
Only enough power to supply pendrives, but drives with their own power supplies, or drives connected to the phone via an externally powered HUB, will work.
Read speeds are fast enough to watch 1080p content.
Unfortunately USB keyboard/mouse, and two different USB gamepads were a fail.
If only I knew a place I could post this where there might be devs around who could read it and make USB gamepad support happen...