With the changes being made for High DPI and display scaling will there be any foreseeable changes in max size for icons over 48x48? Just wondering if I should tweak my workflow to create things at a higher res if things might change in the near future. I don't have a High DPI screen now to use to test with but I am looking at getting one towards the end of the year and was going to start working on updating my toolbars now. My last batch of icons I made were all at 32x32 and shortly after the 48x48 size rolled out so I was a bit bummed.
I don't believe that Mark has any immediate plans on producing a set of 64x64 icons, but with the direction that display technology is moving I certainly would not rule it out. I know that there are currently large-format 8K displays available, but not having one (nor likely to be obtaining one) I have no idea what our current crop of 48x48 icons look like on one. I can't imagine that a majority of our users would be willing to shell-out ~$4K+ for a monitor, so I really don't see it being an issue until their prices fall below ~$1K.
Bottom line is that I really see this as a non-issue for the foreseeable future. I've yet to hear from anyone running a 32" (or larger) 4K monitor complaining about the size of our icons.
Edit: You might want to create a thread in the DataCAD 20 Forum asking for opinions from users of large-format (~32"+) 4K monitors as to the usability of the current 48x48 icons. My 1920x1080 24" monitor is pretty low-tech given today's offerings.