In a surprising move, Google is allowing all Glass owners to upgrade their hardware for free, just this once. Those who purchased the device prior to October 28, 2013 are eligible to swap their Glass for the “new hotness.”
New Glass looks practically the same, but has some minor improvements, including prescription lenses compatibility, better durability, speed improvements, and a mono earbud. By switching out, you’ll have to return your old glass, but you can also change your color selection while renewing your warranty through the voluntary upgrade. Overall, a win.