Cyanogenmod already provides this via Privacy Guard. I wouldn't be surprised if this made its way to the next version of Android; a lot of Android features were

Cyanogenmod already provides this via Privacy Guard. I wouldn't be surprised if this made its way to the next version of Android; a lot of Android features were in CM beforehand (it used to be a running joke that Google got its ideas for what to implement next by copying the CM developers). The CM installation process has gotten way easier (you now don't even need to wipe your phone or lose any data - it installs right on top of the stock ROM), so there's really very little reason not to use it over stock if your device is supported, IMHO.