Google Has Been Working on Watch and Glass in Tandem, Patents Show - Liz Gannes - News - AllThingsD

Meanwhile, in the part of the market actually shipping products today, Jawbone has been bulking up on related patents

"If Google Glass freaks too many people out, the company likely has a Plan B close behind. Another Google smartwatch patent application was published today, describing a tactile user interface for a watch, similar to that of Glass.
Smart watches will likely be coming this year from Google, Apple, Samsung and others — but it’s not yet clear how ambitious the initial products will be."

Google Has Been Working on Watch and Glass in Tandem, Patents Show - Liz Gannes - News - AllThingsD