It seems that the A5 is not the only one o get a S-version, A4 will also get one. Proof? Autoblog.nl caught the upcoming S4 testing.
The S4 will be powered by a 4.2 liter FSI V8 engine, but for sure the output will be bigger than the A4’s 340 hp. The engine will be matted with either a six-speed manual or automatic transmission. The 0 to 60 mph sprint will be made in less than 5 seconds and the top speed will be electronically limited to 155 mph.