The classic MPC workflow is not just another iPad app IMHO. Only folks who have used an MPC know how it feels to them, and those of us who love THAT workflow, these new MPCs look almost too tempting.
Do not try to see the MPC as a version of OT. Nothing is replacing the OT, it's angle and featureset is unique. The combination of both however will be formidable, especially MPCX + OT, since you will (most likely) be able to use the OT MIDI CC modulations for CV control. In a way I almost see the MPC as the fourth piece of a black trinity setup, it can cover for most of the blank cases left (writing linear automation, full polyphonic midi sequencing like with an old atari ST, easy round robin sample playback etc)
A clever move from Akai, not including any CV control on the live.. Makes me want to buy both. But... I.. will.. resist, only the live is indispensable for my current needs.