An update from Iger, definitely retiring July 2, 2019, mapping
out the next 15 years of Star Wars:
We had to deal with tragedy at the end of 2016. Carrie appears throughout VIII. We are not changing VIII to deal with her passing. Her performance remains as it is in VIII. In Rogue One, we had some digital character. We are not doing that with Carrie.
Edit: the Star Wars talk starts here