Interestingly, the new deeper HockeyApp integration recognized that my apps were built with Cordova, but then just shows a "Cordova support coming soon" page for Android and iOS. (The Windows Cordova app was recognized as UWP rather than Cordova. The Windows Electron app I have wasn't recognized at all, but that is unsurprising.)

Nothing in the transition roadmap from HockeyApp :/ https://www.hockeyapp.net/appcenter/roadmap/

On the main App Center Roadmap [1] they have Cordova CodePush dashboarding mentioned, but not build support.

[1] https://docs.microsoft.com/en-us/appcenter/general/roadmap