A reader sent me a copy of a PDF from their friends who have traveled the Arco Norte from Jilotepec (off Mex 57D) to Texmelucan (West of Puebla). This confirms the route is now open! This is great news for many people making routing plans as it avoids the nightmare of the DF (Mexico City) and the maze that used to be the old bypass. The scan is not perfect as there seems to be bottoms of some pages missing but enough is there to get the idea. There are also some photos.
You can download the PDF from here: