That would be an all digital X when they can do a die shrink? And then an X RT or something for the suped up version.
I am not sure how they can have a better S when that's basically the current X.
I would assume they just price reduce the X when they can and make the Series S the $100 black Friday blow out machine the current all digital S has been.
It's clear price is massively important to their strategy, as is Xcloud where 1080p is perfect and will be for a good while.
The One S only had a modest bump to allow for overhead in processing HDR, it was not an upgrade as such to regular performance although they did not hold it back.
As per some previous discussions - there may not be a "die shrink". MS said they learned it wasn't worth it, just go with a new architecture.