My problem seems very similar to the above.

Vibrations occuring (small quick jerks like it is too high a gear) around 2000 rpm at 50 to 60 km/h when lightly accelerating up an incline.

I took it to the dealer, he felt it too on the test drive but had no idea what it was.

He changed the transmission fluid and I haven't felt it come back ever since (5 days).

The dealer also mentioned it might be the torque converter. I pushed to make a claim through my new car warranty and they have agreed to replace my torque converter free of charge.

Hope this helps

cheers

Dan