Following discussions during the summit about not enough experienced users usnig beta (ego having bug reported after official release): maybe we could advertise automatically when the beta site runs a different version than mb.org (triggered by commit/tag comparison on both sites?)

This could be displayed as a banner or a more visible "Use the beta site" link stating "A new server version is soon to be deployed. You can test it on href=beta.mb.o. Help us improve by reporting bugs etc."