At Mobile World Congress in Barcelona, Technical Fellow Alex Kipman (best title ever for a fellow who has a tech-related job) mounted the stage to announce that after four years, Microsoft had a successor to the HoloLens. HoloLens 2 is here, and it's less of a consumer device than ever. That's not a bad thing.   Next-gen improvements include a flip-up visor, lighter weight, more centered balance, and a new fit system that purports to make wearing the headset for long periods of time more comfortable. On the more technical front, the new version has double the field of view of the original, a new time-of-flight sensor, and new eye-tracking sensors.