Hi Brooko,
Don't get on here that much at the mo as my computer is out of action
I can't answer your question on what VW will do but your problem sounds very similar to mine and it may not be the mechatronics unit.
I have a 56 Plate ED30 with 40k miles, FVWSH etc
I bought mine from VW and began to notice similar symptoms. It is most noticable when you release the brake pedal and lightly press the accelerator. There is a small shudder that feels like the clutch is on its biting point.
Took it to VW who done some testing and have diagnosed its not the mechatronics unit but something to do with one of the clutchs (hence it feeling like its on its biting point i guess).
Just waiting for the VW warranty approval to go through.
Interestingly the VW guy said they used to get a few of these problems mainly on the higher powered DSG cars.
Just my two pence worth. Good luck buddy.