It's funny that I pop back on the site and see this thread... I actually saw one of the new Polo's being tested today. I live in Casa Grande AZ and we have a VW proving ground not far from here...
The color combo was a bit wacky, it was bright orange with black accent. I saw it approaching, with the VW badge clear as day, and when it turned into the Fry's parking lot, it clearly said Polo on the back. It was def a finished or nearly finished product. It had, what appeared to be Scirocco rims on it. The front end is styled close to the 2011 Jetta. I should have turned around and snapped a pic, but I only had an hour break before heading back to work.
On a side note, I've also seen maybe a dozen or so different 2012 Beetles in various trims on drives and pulling into the same lot for lunch, I have a thread about it around here somewhere....
Come to think of it, I think the Polo was follwed by a black beetle and the same Golf/GTI chopped test mule that is always in the fleet. It appears to be a 2010 Golf, but with flat black bumpers and 2006 GTI rims...
Anywho, thought I would share!