Reply of the day.
Why can’t they let it go?
IIRC, the original plan was to make nine films, with the first three being in the middle, the second three being the meta-prequel, and the last three being the meta-sequel, so this would be following the original plan.
In any case, those of us who were at "Yo-Hi" (Nile C. Kinnick HS, now at the Yokosuka Naval Base but in Yokohama back in the day), when Mark Hamill was starring in the school plays, will be interested to see how MH fits in the role of Old Mentor; he will have to play it very differently from Sir Gielgud.