There are indications that a 5 cylinder TFSI engine is on the way to be used in the A5/S5.
The power output will be between 300-360 hp.
Based on the output it can be used in the A5 with low 300+ hp or in the S5 with higher up to 360 hp.
A while back there where rumours that say the 5 cylinder plannet for the TT-R(S) would also be used in other models of the Audi range.
Jarod.