The environment change is very cool. Until now I've been using project-level variables that I change by loading environment-specific files. However, I agree that a global capability would make this even better. I have three environments I typically test against and they're the same no matter which project I'm on.
At a minimum I'd like to see the ability to handle the environments like properties. If I'm going to have to add them to each project it shouldn't have to be a manual process. Give me the ability to save/load environments. Granted, this isn't a task that'll be done many times in most cases but the name of the game is streamlining productivity, right?