This is the new Sony Walkman — CES 2015Joe Clayton, president and CEO of Dish Network, makes an entrance at a Jan. 5 press conference at the Consumer Electronics Show in Las Vegas. Clayton unveiled details on its new streaming service with ESPN and Disney.(Photo: Tim Loehrke, USA TODAY)The doors have yet to officially open, but there are plenty of lessons to absorb at the International Consumer Electronics Show in Las Vegas.As...