Belt Drive Bikes about to Hit the Mainstream?

Interbike (the yearly big bang bike show in Vegas) has some great examples of belt driven bikes floating around.  The real question is, will people adopt them and make bike commuting more popular?

Belt driven bikes are lighter and have no grease, so you would think the idea is a shoe-in for commuting.  So what's the problem?  Not enough gears?  Internal geared hubs take care of that, at least for commuting.  Looks like the culprit might be slippage.  Does the new equipment have it solved?

Photo above from the article at Wired.com.

Other links about the technology -

• On Bikehugger
• Lots of great comments on the concept and history at Bicycledesign