I don't have the XSD type loader available in Aardvark OOTB, although it's certainly handy and I have it plugged into Aardvark internally in Guidewire. However, even if the type loader is in there, editor support would be a longer way off.
BTW, for those on this list who are wondering, Studio is a tool produced by Guidewire for use by its developers and customers. Much of its functionality is coming out soon to the open-source world in the form of Eclipse and/or IntelliJ IDEA plugins.