Isn't the Prophet X kinda like a big boy Prophet 12? With some give-and-take of course.
I don't think we'll ever see a P12 mk2, but I do think it's realistic we'll see another hybrid poly based on the Pro 3.
3-4 wavetable oscillators. No VCOs (otherwise it would directly cannibalize the P6 and OB-6).
Ditch one of the 4-pole filters, the external input and the sequencer to keep the price down and to keep the Pro 3 more "special" (alternatively, Prophet X filters).
At least 6 voices, hopefully 8, 12 or even 16 (though it might, depending on filters, put it close to Prophet X territory price wise).
User wavetable import is a must, in my opinion. This way you could import P12 waveshapes, and essentially have an endless palate of oscillators.
Direct mixer access to each oscillator would be nice: dedicated knob to volume, waveshape, etc.
"Happy bithday, Dave! She's from me."
"I'd buy that for a dollar."