From Ali's email:
"The plan for the short term, meaning the deadline Google gave us of February 12th, is to just get a simple 1-page site up, that points to developer activities on/for MDN. Chris Mills wrote up a content draft, and the MDN engineering team is going to do the development for the web page itself. Long term, we may, or may not, decide to replace developer.mozilla.org with mdn.dev, but that has not been decided yet and won't be before the 12th."
Here is the proposed page design/layout:

Looking good @schalkneethling . I think the different repo names could all do with being links to those repos, and maybe the content areas could do with being linked to their respective landing pages, but I think that's about it.
I'd also like another writer to sanity check the content. @a2sheppy , can you give the mdv.dev content I wrote a quick look over to make sure there is nothing terrible in there? ;-)
thanks for the feedback @chrisdavidmills
I have updated the content to link to all the things.
This appears complete, https://mdn.dev is up
Most helpful comment
Here is the proposed page design/layout: