On-body networking: modular CPU/RAM, storage, radio, modem, router, battery, AR headset, battery, etc

Heads-up display: Google Glass was weird. The focus was on "gargoyle" stuff, not on AR. The display needs to integrate with and enhance reality. Not a small area in a corner.

Speech-to-text interface: That works very well for me. For short messages, anyway. Proofreading and editing is essential, however. To avoid embarrassment and confusion.