Nissan to Unveil "Revised" 2013MY 370Z at the Chicago Auto Show

We received word today than Nissan will debut a "revised" version of its 370Z sports car series at the upcoming 2012 Chicago Auto Show via an invitation to a press event that will take place next Thursday.
Unfortunately, the invite does not detail the changes on the 2013 model year 370Z so we don't know if it's a full facelift or a minor nip and tuck with very subtle updates here and there.