My understanding is that would be R8RS, and would be a continuation of R6RS. They seem to be doing the tick tock sort of model of alternating focuses for "releases".
Thanks - in fact bgruber's video link above [1] about R7RS-small also includes a section about R7RS-large too. I hadn't seen the video when I asked my question.
Basically another working group will work out the details at a later date and it will be much larger - about 80 packages and probably bigger than Common Lisp according to the video.
From what I understand R7RS small is aimed at being closer to R5RS while avoiding the controversial things introduced by R6RS.
But what about R7RS large? What are the overall aims of that? Has that been decided yet?