We have successfully tested EPIC HDRx to 18 stops of dynamic range in motion. You can use the mode in two ways... Easy HDR (in camera) and HDRx (manipulate in post). It can be used several ways, including the "magic" way... which is very cool. Or there is a "normal" way to deal with motion blur. Since it is very rare to need 18 stops, you can set different HDR settings... like +3 stops, +4 stops, etc.
You are really going to love this. We are working with the Foundry for the HDRx mode. Graeme and the Foundry boys make a powerful combination.