the answer is...newer.
the A4/A5 B9 will be nice to be like followings:
-RS4/RS5- 450HP from 3.0V6 engine
-S4/S5-360HP from 2.5tfsi
-a regular A4/A5 with 300Hp from the 2.0tfsi S3
-a regular A4/A5 with 240-250HP 2.0tfsi
-a regular A4/A5 with 170-190 HP from 1.8TFSI
-a regular A4 with 140-150HP from 1.4tfsi
from the diesel side, I will like to see as followings:
but, will never be like this.
fore sure audi will offer a regular A4/A5 with V6 petrol engine like is this days the 3.0tfsi with 272hp.
and I dont't think that audi is capable of having a 2.0tdi twin turbo, even is they see that the competition has a 4 banger diesel 2 turbos since 4-5 years ago.