Google Glass has 16GB memory, 802.11/b/g only, Rated for 1 day of battery life.

[grief]

http://support.google.com/glass/answer/3064128?hl=en&ref_topic=3063354

[jfoster]

... and the most interesting bit is that some features (SMS and GPS) require an Android phone.

[toomuchtodo → jfoster]

With weight, power, and space constraints, you're of course going to offload as much as possible to the phone.

You could probably do Hangouts without a phone though; anything that can be done over IP should be fine not needing the phone.