User blog comment:Brandon Rhea/How we're testing the fandom.com domain migration/@comment-28083312-20180928054231/@comment-20644-20180928155428

It will be served for everyone as part of the migration.

Also, from an SEO perspective, HTTPS is a bit of a net neutral. Google ranks HTTPS favorably, but HTTPS also means a site loads a bit slower which means you can take a slight ranking hit. So just having HTTPS doesn't automatically mean you rank higher.

The reason a site would provide HTTPS is for security, not for SEO.