At release. A Mac and Linux release is planned for later.

> [..] We also have the Classic ASCII mode to support, and we are also working on Mac and Linux builds.

https://store.steampowered.com/news/app/975370/view/30990438...

That I don't know - I do know there's a large group that do NOT want the improvements to the UI/graphics, because they're set in their ways.

I suspect that at some point things will begin to settle down and merge.