Hi!
The idea is that we can implement some revolutionary ideas for our portal page, things that are completely different than what the current portal page looks like, and deploy it on this site for real users to use. But without imposing a disruptive user experience to our users. We can put a link to this page on the production portal page (in the bottom?), and users can have an option to bookmark the page, and maybe make one of the experiments their default.
This looks pretty cool, though I think we need some explanation why these pages are shown.
Also, if you look at it, number 4 is porn site. Which is I guess accurate according to data, but this would produce several problems - starting from obvious appropriateness and PR issues, and to the problem of what happens when companies (even much less controversial than porn sites) learn that they can be easily featured on the front page of Wikipedia. So we may want to be careful there.
Also, https://people.wikimedia.org/~jgirault/react-top10-languages/ is buggy for me: for Hebrew, it shows the name as: <bdi dir="rtl">עברית</bdi> (yes, with HTML tags visible).