New OLY 14 150 EZ coming? Would you buy it?
It's unlikely to shrink, as it's already quite small (the updated Panasonic 14-140 is of approx. the same size).
What I think is likely to happen at some point is that when/if Olympus sells out of the current batch sitting in their warehouses, they will update the exterior to match their newer lenses, the way they did it with 40-150 and 75-300. I would not expect any major tweaks to the optical or mechanical formula though -- 14-150 is already a relatively fast and silent focusing lens.