I guess I just consider the hypervisor.framework to be not at all exciting. How long has virtualization been out now? When is container.framework coming? I'd also accept jail.framework.

Of all the cool things to do with virtualization or code isolation, they haven't encouraged (or really even enabled) any of it except via the app store sandbox, which isn't even very useful outside of security concerns. 10 years ago I was emulating distributed software on freebsd, including network delays; it's still a damn hassle to do the same setup on darwin.