Here's a useful link to the progress being made on the new visitor centre and the alterations to road systems around the Longbarrow roundabout and Airman's Cross areas:
http://www.english-heritage.org.uk/daysout/properties/stonehenge/our-plans/project-update/
From English Heritage:
"Stonehenge Project UpdateDecember 2012
As Stonehenge gears up for winter, we wanted to let you know we're making good progress with the new visitor centre at Airman's Corner. This time next year, work will have been completed and we'll be busy preparing for the opening." [cont]
Includes aerial photos.
Something is not right. This message is just to keep things from messing up down the road