I just saw this app today. It's made by the same people behind Dynalist, which is similar to Workflowy. I know other people on here have been on a big Roam kick, and I think Obsidian allows importing for Roam tags (or something, I haven't used Roam before.)
I think Eli previously asked for some mind-mapping software. This seems relevant to people who want a new way to do their note organization in a mind-mapping way.
The screenshot looks pretty clean:

I'm also trying this out, and I'll try to post my personal thoughts later. They have a public roadmap you can follow. I've been using Typora as my editor of choice for a while now because it supports inline LaTEX and a nice markdown styler, but it looks like adding support for these two things is on the way.
The output is in SVG format, but the cool thing about SVGs is that they (a) can have hyperlinks in them, and (b) can be displayed in the browser. So the generated SVG is displayed in your browser, and each of the nodes are links to the wikipage the node represents, so you can indeed use it to navigate the wiki.