Yes. Although there will be (already is) a historical version of the User Manual for version 7.
That is the plan.
I doubt it. Well, maybe searching for the mark for v8, but that is likely to be short (like v8), so I don’t know how well searching will work. Finding info on the new version will best be done in the What’s New section as usual.
That continues to be an ongoing process of harmonisation. Some improvement may be made, though it wont be a specific focus of work at this point (getting the v8 docs complete will be the focus, with a lack of regression in this area, but not necessarily improvement per se).