Well, I saw this completely accidentally Tongue Out but here is a patent application from Microsoft

http://www.linkedin.com/pub/surupa-biswas/3/641/b08

Optimizer as an AppStore Service
    United States Patent Application 334486.01
    Filed December 15, 2011
Inventors: Surupa Biswas

Sounds like the Cloud JIT for Windows Phone 8 to me.