My bet has always been on Amazon, they have the weird partnership and integration. Would make sense for their cloud business too.
It would be odd if they do. They seem to pushing all their Linux efforts on Amazon Linux 2, which is a clone of Red Hat Enterprise 7.
Also Microsoft has a nice partnership with them to make Ubuntu the main distro for WSL.
Oh god, please no
I can see the headlines now: "Canonical unveils Windows subsystem for Linux with full support for COM objects."
I actually wouldn't mind being able to run things like Office and the Adobe suite in a reliable and officially-supported way under Ubuntu. Although proper native packages would be preferable, of course.