http://ee-prototype.wmflabs.org is for now the Velvet Revolver of UX changes, where you can see how they play together. As the main page says before spammers get hold of it:

MediaWiki core on this server has UX patches that change the appearance of the site:

• Trevor! I63e073b4 "Add Agora mw-ui-button classes to various buttons"
• Jon Robson! Ica0b69ad "Apply mobile typography lessons to Vector on desktop"
• Mark Holmquist! Ia215c587 "Implement agora-style checkboxes experimentally"

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Try logging in at http://ee-prototype.wmflabs.org/wiki/Special:UserLogin to see all three jamming. Try editing a random page to see an edit (source) form with Agora buttons.

I hope to soon have the Jorm! Agora Flow prototype on it, though until someone merge its CSS into mediawiki-ui it'll be a solo project.

(Naming the patches is not to ignore the contributions of many other people.)