My "local" big-box home improvement store sells a pressure treated lumber called AC2. Apparently this is different from ACQ in that its environmentally friendly, but still can be safely used with aluminum. I can't find very much online about this other than the product brochure from the manufacturer here.
I'm just trying to get confirmation from someone unrelated to Menards that this lumber is ok to use with aluminum flashing because everything else says not to use aluminum with the new types of pressure treated lumber. Thanks.