Now we see through a glass, darkly...
- Apr 5, 2016
I doubt very much that Canon would introduce pixel-shift only for the R5. My guess is that pixel-shift capability is very much in their software development roadmap. As such, introducing it in R5 would be likely an incremental cost rather than an all-hands-on-deck, high-cost effort to make it work only for the R5. Besides, adding it to the R5 would allow Canon to do an extensive field test of the software before it becomes a mainstay for their higher end cameras (or hopefully, for all bodies with IBIS).
The work has to be done, regardless.
The cost of that work is significantly more than ZERO, which is what the comment to which I responded stated unequivocally in no uncertain terms.