Instructions are here: http://www.myce.com/news/how-to-uninstall-kb3035583-the-wind...
Still, on the plus side, it'll probably be lucrative for IT techs when non-contract clients brick their machines with failed updates, or when machines with unsupported graphics cards get updated.
http://betanews.com/2015/10/15/microsoft-now-uses-windows-10...