I saw this thread, and I promised myself I wasn't going to plug Kakoune -- I think NeoVim is a great project and I want it to succeed. They deserve every bit of the praise they're getting. But I'm going to have to break my promise, because Kakoune has the exact feature you're after, and I'm using it right now. That, along with familiar keybindings, selection-oriented modal interface, tmux integration... I could go on. Kakoune is a modern modal text editor for your terminal, and it's worth trying!
Caveats: if you depend on plugins to give you an IDE-like experience in Vim, kak is not for you. Your vim plugins won't work. If you use Windows but don't want to use Cygwin, kak is not for you.
Kakoune is always super tempting to me but the plugin thing is a deal breaker for me. Not for IDE-like features but because limiting myself to vanilla vim motions feels like using a bad vim plugin by now.
At least surround.vim, targets.vim and a couple custom text objects.
I think the current goal is to let neovim instances to communicate p2p so that they transparently use the same session. Mostly because adding multi-tenancy to vim would be a living hell without adding much over that approach.
Has been a while since I have read up on that, though.