Page previews have demonstrated great success on Wikipedia where it is loved by many. It may not work perfectly for _all_ projects but the fantastic impact on Wikipedia and the expectation that it kind-of sort-of works most places makes it an excellent candidate for at least a beta feature. For example, on the Commons and Wiktionary projects. This stub task tracks the discussion to enable both page and reference previews as a beta feature on all projects where it's not already in production.

Related: T111231, T203981, T222017 (and probably others!)