AS web site features today an article including a video of the climb to Los Machucos
http://ciclismo.as.com/ciclismo/2016/10/06/vuelta_espana/1475787562_457770.html
They mention the possibility of having that stage on the last Friday of the race; which means either they don't know yet if the final mountain stage will be Angliru or Veleta or they just want to trick the Cantabrian authorities about how decisive the stage will be.
http://ciclismo.as.com/ciclismo/2016/10/06/vuelta_espana/1475787562_457770.html
They mention the possibility of having that stage on the last Friday of the race; which means either they don't know yet if the final mountain stage will be Angliru or Veleta or they just want to trick the Cantabrian authorities about how decisive the stage will be.