I did a brief write up on some of the biggest new features here: https://gpanders.com/blog/whats-new-in-neovim-0-7/
Thanks for summarizing the highlights!
The client-server part is the one I'm most excited about. It is one of my favorite things in kakoune and it'll be nice to have it on neovim too. I find it more intuitive to use separate terminal windows with all the usual window manager shortcuts, instead of using vim-specific terminal splits.
Do the kakoune and neovim keyboard shortcuts conflict for you? I've put off trying non-vim modal editors because I think there's only enough room for one set of shortcuts in my head. How difficult is it for you to switch between them?
It's not too bad, because the most basic commands are about the same. The ones that get me the most are dd and V. When I switch to the other editor I get these wrong a couple of times before the mental model readjusts. That said, I never was a super advanced vim user because I couldn't remember the rarely used motions. Part of the reason I started using kakoune is that I find it easier on my brain. Basically everything is in Visual mode by default, where you select before issuing the command.
I recently came across the which-key.nvim (https://github.com/folke/which-key.nvim) neovim plugin, which helped me a lot to speed up finding what movement I want to do. It basically shows you a popup with what combinations are possible after you press any key (while nvim waits for the next one), so you can basically explore commands by just pressing keys, instead of having to look them up.