The rumored Audi S1 seems to be on track for 2013. Good news!
The guys at What Car? are now reporting that this S1 is due for launch in around 18 months. It would share much in common with the A1 Quattro, including the turbocharged 2.0-liter engine, though output would almost certainly be detuned to saner levels. Expect the final number to lie somewhere between the 256 horsepower of the A1 Quattro and the 182 horsepower of the A1 1.4 TFSI model.