LP bzr revision number largely useless with rocketfuel mapping

Launchpad's various instances have seemingly incomparable revision numbers (as displayed in the bottom right-hand corner). It's difficult to ascertain where they are with respect to each other, and (particularly) rocketfuel. Now that launchpad-beta-testers is being automagically redirected to edge, it'd be even nicer to know what to look out for. RF revisions are normally noted in bugs as they are fixed.

Displaying the latest rocketfuel merge revision somewhere would hopefully fix those usecases. As it stands now, the displayed revision is useless.