I stopped by my local Audi dealer to look at what they had for 2012 and also inquire about 2013. With no surprise there was little to no info on when 2013 ordering would be available. The sales guy was knowledgeable but said he hasn't yet heard anything.
He is tempting me with a premium plus 2012 S4, phantom black with all black nappa silk, B&O sound, stainless steel inserts, MMI, 6MT, advanced key, all weather mats and trunk tray, wheel locks, and the nice supercharged decal added to the car. He said the sticker was $54,620 on it, but there was plenty of room for a deal because he said they currently have too many S4s on the lot.
The only major thing I wanted was the rear sports diff. He said that most if not all their lot orders never come with it because so few order it. I don't even know if I'd know the difference if it did have it, but I read good things about the option from various forum posts. The good news is that this S4 is in their remote lot, so no one has test driven it yet. He said he'd work a deal with either this or a 2013 and was not pushy, but I could likely save a bunch more with the 2012 for the obvious supply/demand reasons. I also had him show my an S4 with the red/black nappa seat option and I'm glad I got to see it in person, because I'm no longer a fan of that option. I felt the red was too much for the interior or possibly it just didn't look right in the monsoon gray exterior. Had it been in a black S4 it may have looked better with one less shade/color in the mixture.
So, minor facial changes aside, the biggest things I can see worth waiting for a 2013 would be the improved MMI and electric power steering. From our previous discussions it looks like paying MSRP on an ordered 2013 may be what people pay? I dunno...I'm seriously considering this.