The world's biggest tech event, CES, is upon us. In past years, the Las Vegas-based trade show has presented such memorable innovations as the first-ever home VCR and the (short-lived) Nintendo PlayStation ー but this year will be all about 5G. "Just like the transition from 3G to 4G, this transition from 4G to 5G is inevitable ー it is happening," George Slefo, Ad Age technology reporter told Cheddar Monday.