When?

[VladimirCores]

Please Adobe make it real next gen language! Support the community of AIR developers. Make it payable but please keep it alive because it's great technology.

[Lusin333]

I'm still waiting for Adobe to release Actionscript 4 for Adobe Animate.

[DraconicNEO]

I'm still waiting for Adobe to release Actionscript 4 for Adobe Animate.

Somehow I don't think they'll be doing it. Maybe someone will, eventually... likely as some community open source of hobby project. But I don't think we'll get an official Actionscript 4 from Adobe.