From what I read the TT 3.0 VR6 is not guaranteed yet as VW doesn't have much use for it. A high performance CC R or Touareg is perhaps the only VW that needs 300 + hp from a VR6. Actually the Touareg (next generation) could go with an Audi or a Porsche V6. Perhaps the new US crossover could use down the line but that vehicle is not 100% approved yet either and the current VR6 would be sufficient. But using this engine in two back to back concepts is interesting.

The 2.5T will remain in the TT RS and RS3 I would imagine but not go anywhere else as apparently Audi won't let VW use it for say a high performance Golf/Jetta or Passat.