900 450i and POE voltage

Since the 900 MHz 450is will be going back to 48-56V, I'm curious as to the direction Cambium will be going with POE voltages.

Will we see all APs in future going to 802.3at specs, while the SMs stay at 20-32V, or will we see everything shift up to 802.3at?  Is the shift back to 48-56V just to come in line with spec, or is there a more practical reason for the higher voltages, ie. reduced power loss?