I want ... a lot of things. I need to see in Mathcad Prime (and can't enumerate only 3):
Word processing tools. And not just the basics. Advanced's please. --- To full develop complex projects.
Sketch tools. With full native scripting drive support. --- To show those things that can't be explained with text or numbers. Also, with choosed values from the sheet to the draw.
Symbolics support. The basics (and maybe we can desagree about what's basic) to improve speed. --- Mathcad Prime 1.0 came without symbolic kernel, isn't? Without it I can't figure something useful to do math or engineering calculus
Script support for both, numerical and symbolic programming language. --- Math must to eare also so rigourus that sometings must to be implemented in the low level programing's text code, and not in the usual mathcad fashion wisiwig view.
Free (not trials) viewer. In the form that PTC understand that can give it: as save-disable, like the old mcad engines avaibles in Mark's handbook, or Schaum series, or a viewer without symbolic and numeric kernel, that show values stored (if they are) in the worksheet. --- Pdf or Html are not enough.