Ben Brauer has some reference guidelines:
The AlwaysOn project strives to address the challenges of building mission-critical applications by providing organizations with a prescriptive architectural approach for the Microsoft Cloud.
It leverages lessons from numerous customer applications and first-party solutions, and applies Well-Architected best practices to provide actionable and authoritative guidance for building and operating a highly reliable solutions on Azure at-scale.
I guess marketing is calling it “AlwaysOn” again. Until they call it Always On. Or AlWaYsOn.