Google App Engine to support Dart
code.google.com
code.google.com
In the event they did a few days ago, I think it was the managed VM part where they demoed SSHing in and switching some things over from managed to manual, so I imagine it is much closer to compute engine.
This is like saying that Dart can be run server side on an EC2 instance. I would like to see Dart (server side) added to the AppEngine supported language list (Go, Python, Java, PHP).
Managed VMs are no different than Amazon or Azure VMs.