It looks like the developer behind this refactoring effort has some really good ideas for decoupling the Vim engine from the user interface layer. It'd be great if somebody could build a really good cross-platform Qt-based UI on top.
(And you'll probably retort with the failure of an exchange that almost everyone in the Bitcoin community has been hoping would fail for the past 3 years).
But seriously, I'm pretty sure that you can exchange Eve online currency for Bitcoin, so I'd sure take it as a donation if someone offered.
Would the variable-width fonts be simply for display with plain text being edited and buffered, or do you wish to be able to have rich text formatting within the editor (e.g. italic, bold, smart quote marks &c)?
Just interested: rich text formatting has been suggested for emacs I recollect.
[0]: https://lists.gnu.org/archive/html/emacs-devel/2013-11/msg00...
For formatting, I mostly use Markdown. Ideally, I'd like to see the literal markdown for the paragraph under the cursor, but formatted text for the rest of the buffer. There's actually a script with a pretty good first pass at achieving that kind of Markdown support via Vim's "conceal" feature, but some of Vim's inherent limitations make it imperfect: https://github.com/tpope/vim-markdown/pull/9
I'm hoping that the way neovim decouples the UI layer from the underlying editing engine will make it easier to address issues of that nature.
Now, would the cursor be a block over a character or a caret between characters? A lot of history riding on that one.
Jef Raskin's Canon Cat springs to mind with its in-place commands (but not Vim's modefulness).