As this sort of wearable computing takes off, it's likely that hearing systems will become and integrated part of the wearable computer.
All we need to see is a receiver wire port on the underneath of that Google Glass arm and your hearing system becomes integrated with your mobile computing and comms. There's already a mic system built in and the front of the frame will allow a decent mic array to beam-form at full head-width away from obstruction.
The fact that Google is putting it's name on the hardware is great as it means the output is likely to be largely open source which allows anybody to develop it. The blurring of the line between comms/computing and hearing aids is going to cause the FDA and the hearing aid manufacturers a few problems too.