According to the feature-set, this is basically NeoVIM.
* Separation into front-end and back-end: NeoVIM does this. The UI uses the same interface a plugin does.
* Asynchronous operations: NeoVIM uses libuv to do this (same asynchronous C++ lib as NodeJS).
* Plug-ins over scripting: Yup, NeoVIM does this, as well as dropping vimscript (although it will compile vimscript into Lua for you).
* JSON: NeoVIM uses msgpack, which is significantly less overhead than JSON, but structure compatible.
The two other features listed are Rust and rope-structures, which are implimentation specifics that don't affect users or plugin writers at all.
Edit: The more the merrier! And it's good to see more projects using Rust, but I don't see this as a strong need. See https://github.com/rogual/neovim-dot-app for a nice native Mac UI plugin/client for neovim.
* Separation into front-end and back-end: NeoVIM does this. The UI uses the same interface a plugin does.
* Asynchronous operations: NeoVIM uses libuv to do this (same asynchronous C++ lib as NodeJS).
* Plug-ins over scripting: Yup, NeoVIM does this, as well as dropping vimscript (although it will compile vimscript into Lua for you).
* JSON: NeoVIM uses msgpack, which is significantly less overhead than JSON, but structure compatible.
The two other features listed are Rust and rope-structures, which are implimentation specifics that don't affect users or plugin writers at all.
Edit: The more the merrier! And it's good to see more projects using Rust, but I don't see this as a strong need. See https://github.com/rogual/neovim-dot-app for a nice native Mac UI plugin/client for neovim.