You also have Brawn getting both a Titanmaster and Legends release in TR.
That said, I don't think you can treat Scorponok like the Headmaster Jrs. Yes with the Headmaster Jrs, HasTak missed out on a half dozen deluxes, a Voyager with Apeface, etc, but they really are a different kettle of fish.
One thing I've noticed is there seems to be a sense of completionism at play with this trilogy with the Combiners and Cityformers.
The fact is that with the exception of the Seacons (and for all we know, they're a later release yet to surface) and Monstructor (although people are noticing the similarities between PotP Cutthroat and Wildfly so who knows), this trilogy will have given us every single combiner from 1985-1988 that saw release in both markets.
Likewise if you class Omega Supreme as a Cityformer (although that's somewhat of a long bow to draw), then there are only 2 Cityformers which have yet to have been given a modern update in the last few years.
Given the way PotP combines gimicks from all three parts of the Trilogy, I highly doubt that we wouldn't get a PotP Scorponok finish off the Cityformers.
In fact I wouldn't be surprised if the figure came with a Deluxe sized head which had a Matrix slot or Prime Master slot of some kind.