Google Glass V1 will be an iPhone Accessory & Google Glass V2 will double your Fun - Patently Apple

Version number for the cranial implant option still tbd

"And just as we're getting ready for Google Glass for Q4 2013, a new Google patent was discovered by Patent Bolt today that reveals Google Glass Part 2 is already in the works. Google Glass 2 is all about Binocular Vision. Google Glass part one is about the famed monocular design for a single computerized lens and camera while their future Binocular design will be for dual lenses and cameras to double your fun.
You know that Google Glass V2 is a serious project when Google's Co-Founder Sergey Brin is listed as the lead inventor on their published patent."

Google Glass V1 will be an iPhone Accessory & Google Glass V2 will double your Fun - Patently Apple