Never going to happen. Just do a search with firmware as the subject. The company-line appears to be the PX-S1000/3000 perform exactly the way they were designed to, and differences in firmware version are only for the company QC, so don't hold your breath for any future updates that they will make available.
At this point I only use mine as a weighted controller for VSTs WITH a separate control surface, just because of the light-weight/small footprint.