A new version of Google Glass is coming. Google announced today that current owners of Google Glass, called "Glass Explorers," will be eligible to "swap out" their existing Google Glass units for the new version.

The next version of Glass will finally be compatible with people who already wear glasses via "future lines of shades and prescription frames." The second edition of Glass will also include a mono earbud, likely replacing the terrible bone conduction speaker in the current version. Still, Mono-only sound remains a bit of a disappointment, as listening to music on Glass would be a very useful feature.

Google also announced that Glass Explorers will get three invites to the Glass program to hand out to friends. (It's just like the Gmail beta... if access to Gmail cost $1,500.) Google hasn't said if the trade-in program will have any additional fees, just that existing Explorers would have access to it. The only advice Google can give current users is to keep checking their e-mail. The program trade-in program starts sometime in November.