The 3.0 VR6 TT (as seen in the VW concepts) wouldn't work in a A4/A5. And that engine is not confirmed for production. Not sure what Audi is going to do with its next FI V6. I am not sure if they can do a V6 with the turbos inside the V like on the S6/S7/S8/RS6/RS7 as there is less space to work with. They might just stick with the supercharged option and update it.