The Fraunhofer Institute has been showing their bi-directional OLED microdisplays for quite some time, and today they said that during SID 2012 they will unveil an evaluation kit of their see-through data eye-glasses for the first time. Fraunhofer's glasses are made from monochrome VGA bi-directional OLED microdisplays and use special eyetracking algorithms.
We don't have more technical details yet, but the 2011 demo unit inlcuded a monochrome AMOLED display (320x240) and a 160x120 monochrome camera. The brightness was 15,000 cd/m² and the chip size was 0.6" diagonal. Back then they said they are working on higher resolution displays (VGA and above) and smaller chip sizes (0.5"). So indeed the resolution is now higher (VGA).