The Google Glass Team has quit their initial Glass project and moved onto other projects - one of those was rumored to be Google Glass 2.0. It appears, however, that they are working on multiple project and one of these doesn't include a display - at least a traditional "Glass" display. Google knows the future is really about wearing technology, but there are many ways to make it happen. It will be interesting to see what CES 2016 brings.
Sources for The Information understand that there are three next-generation headsets in development, and that one of them doesn't have a screen at all -- it's an audio-focused model meant for the "sport" crowd. That sounds like an amped-up Bluetooth headset to us, but we'll reserve judgment until there's something to see... or rather, hear.