The new release is out!
Anyone who donated (read: Satoru, and pwndoctor) will have access to it if they want.
The public gets it when the next major release is released.
Features: Amputator, Kritzkreig, Ambassador, Vitasaw, Blutsauger, Huntsman.
Edit: The current, non-public version includes EVERYTHING in my backpack: http://www.tf2items.com/id/insani99999
Second Edit: Except the poker night items, they don't like being modded.