After being slightly pushed by Jens again, Iām finally trying to answer some of the questions/suggestions here 
1. plans
Iām afraid I canāt be more detailed about the plans for future releases. There are so many suggestions coming in and every new release is just a set of decisions being made in āreal-timeā while building it. I never really have a fixed todo list and even if I had, I wouldnāt give it away. I learned in the last years with Kirby that making promises has always led to disappointment or too much pressure.
2. Custom admin pages
This is on my personal list for a long time now. The panel refactoring was a huge necessary step to get there eventually. (next version or future)
3. Custom admin sidebar
I already worked on hiding pages in the sidebar from the blueprint. This led to a performance issue, so I removed it again, but I will keep this in mind (future)
4. Revisions / page versions
I thought about this a lot and as much as Iād love to add it, it would also add so much more complexity. (maybe)
5. Duplicate / clone
Never really thought about this. (maybe)
6. Move page level
Yes, definitely on my list for a long time now (next version probably)
7. Change the menu system
I still think that the differentiation of visible/invisible pages has its place. I know that there are some connected issues for more complex menu situations, but this is easy to fix with structure fields in the site.txt to controll the main menu or multiple menus for example. This is in fact such a fundamental part of Kirby, that it probably wonāt go away. I know that there are suggestions to move the sorting into the files, but this would lead to worse performance and this is not an option.
9. Title not required
Yep, itās fixed
10. Not all folder paths can be edited
Iām not sure if it makes sense to mak all paths editable. This would lead to a lot of possible problems, but Iām always trying to make the kirby, panel and site folders more flexible and this is definitely something Iām open for additional changes.
I hope the answers help to get a better idea of the next steps even though there is no fixed roadmap! Thanks for the time you are spending on thinking about that stuff and asking such questions. It definitely means a lot.