BARCELONA—Monday at MWC has been a weird one for Sony. Aside from announcing its Xperia Ear—a Bluetooth headset-cum-virtual assistant—alongside the likes of a wearable 360-degree camera, and a quirky laser-projecting robot, it also unveiled a new set of Xperia phones, dubbed Xperia X. Not only do the Xperia XA, Xperia X, and Xperia Performance arrive...