There's plenty of work to do in the existing product families with modest improvements in existing capabilities.
However, I suspect some limitations in "buffer" and video are related to PRIME II. It may be time for new image processing and a new (HW) processor.
In terms of system architecture, the camera is a far from optimum place to perform certain image manipulation functions. We can do a much better job of HDR, image stacking, NR, etc. on a standard Intel/AMD desktop.
But the user base doesn't think a great deal about optimum architecture. Nor should it.
People who buy cameras want better photos created (and shared) more easily and more quickly. I expect we'll see a PRIME III before too long that will get us all lathered up.
But after the mandatory K-5 purchase, I may miss that train ......
I wonder if that PRIME III can be coupled with EVIL, 645D Mk II, and/or FF introduction ......