The Nook is on life support. Device sales are down. Digital content sales are down. Revenue is down. Things look bleak, but B&N plans to keep the devices around at least through 2013.Today in its 2013 year-end report, Barnes & Noble detailed the sad state of the Nook but said it will continue offering the Nook HD and Nook HD+ through the holidays. The company will also continue to support the devices in retail stores. However, things are about to change dramatically with the Nook brand.