Google looks to be adding more tools to Search Console with these screenshots send from a reader today. Google is redesigning many of their testing tools with the new Material Design framework and the Mobile Usability is the latest to get a redesigned look.
Google is letting web masters know that they should expect to see pages that have mobile UX issues to rank lower in search for those users. Right now, the tool isn’t particularly robust as it just offers the number of issues as well as the issues per page as well. It appears that it covers the last 90 days just as the normal Search Console data export does.