Pointed out by Michael Potuck, 9to5Mac, this was tucked at the end of Apple’s MacBook Air announcement:
Mac mini Also Updated Today
Whether they are using it as a desktop computer, a music and movie storage hub for the family, or as a code compile server for Xcode, customers love Mac mini. The standard configurations of Mac mini now come with double the storage capacity. The $799 configuration now comes standard with 256GB, while the $1,099 configuration features 512GB of storage, and every Mac mini is made from 100 percent recycled aluminum.
Good to know.