Spatial Annotation Getting Mainstream in Two Years?

Spatial annotation is getting more and more light it seems. The mainstream PCWorld mentionned Siemens Digital Graffiti project in Post-It Notes Go Mobile. According to Siemens, there are about two years from commercial roll-out. It is unclear on how the handle the message positioning (with simple cell IDs?) and how (un)accurate it is. They do not talk about any specific scenario either. I guess that is why there are not rushing it out of their lab.