Was it SmartGlass that first tipped you off? How about the Wii U’s new GamePad? The promise of the Sony PlayStation Vita cross-play games? How about the huge number of traditional console game companies showing off their latest entries for the mobile arena of smartphones and tablets from Apple to Android? This year’s Electronic Entertainment Expo (E3), a sprawling, industry-only conference of the biggest names in video game entertainment, has gone mobile in a big way.