OK, another weekend speculation for fun :)
recently I stumbled upone some interesting stuff new in Windows 8.1 kernel: Pico
there are these new functions inside 64bit ntoskrnl.exe in Windows 8.1:
and there a a new ApiSet stub library, which ntoskrnl.exe imported from:
and it exports these functions:
The name PicoProcess sounds very interesting because Drawbridge/Xax/Embassies used this term
So, is Drawbridge in active development in the production teams, hopefully yes, for example, here is a guy working on it since January 2013, who is in the Windows Azure OS team:
Responsible for development and refining of Drawbridge V1, a MSR project which provides a low-overhead alternative to traditional Virtual Machines.
and here is a job posting from Azure OS team:
We are part of Windows Azure operating system team within Windows Azure platform. ...... Our deliverable includes a virtualized operating environment that can match a native machine characteristic with equivalent resources.
and here is an old job posting specifically mentioned Drawbridge (https://twitter.com/MaConfig found this):
and here is a patent from the TeamFoundationServices/VisualStudioOnline team, talking about Drawbridge/PicoProcess (https://twitter.com/josefajardo found this):
In some embodiments, additional isolation may be provided by using a virtualization technology such as Drawbridge—a technology developed by Microsoft® Research of Redmond Wash. Each user's build will run in a Drawbridge picoprocess, giving it further isolation from the worker build machine, thus improving security.