In the long run, WVUI should be a great replacement for OOUI in gadgets for making simple and easily-reused code.
A demonstration workflow for setting up a "Hello World" script would be a good first step to starting to introduce it.
I imagine such a script would simply pop up the most basic dialog (once it exists as a component) and allow to dismiss, thus keeping the focus on how to set up WVUI for the gadget environment as opposed to actually using WVUI's features/components (for which the documentation would presumably be the same as using WVUI in core JS?)