I suggest that you have a look at the new A3/S3 pdf brochure online. There appear to be no electric adjustment or options for the seats, the only note is that thay are electricly heated (as is standard on the new S3).
I propose to get them on the S3 I order - assuming the test drive is OK (booked for Monday 13th all day)
Following a video on you tube of an S3 test drive in Germany the seats seem to look like they don't perform the same as the current S3 (i.e. tilt and slide forward), but I can't believe that Audi are that daft in their marketing/build as they are so detailed in other areas of interior design...