Announced back at last year's Winter NAMM, Akai was showing off the MPC Fly again this year. I almost had the impression that they weren't showing it at all, because no one had a video for it. I guess it wasn't really news at this point.
Fortunately Nova Musik checked it out anyhow and was rewarded with some new details! Apparently the MPC Fly case itself has an on-board battery so that the iPad is not drained by its use. There is still no mention of a release date.