The Audi S1 quattro is currently undergoing testing and according to German Auto Motor und Sport these tests seem to go extremely well and the Audi S1 quattro is now expected for 2013.
Here are some other nuggets:
– will receive the same Haldex quattro system as the Audi RS3
– current prototype has 186 bhp, but development is not finished here
– expected price for Europe, below 30.000 Euro
– 2012 will see the 5-door Audi A1 Sportback
– 2013 the Audi A1 convertible is also coming
– Hybrid version is also in the works