It's kinda hard to remember how it was back when I first got it as compared to now. I think now it has a bit more get up and go and better gas mileage, but don't quote me as gospel.
My dealer also had it driven in (30 miles or so). It's entirely possible that something happened, but I doubt it.
I tried feeling for the sensation tonight while driving... what I DID feel was vibration. This happened at certain speeds, particularly when the CVT was working hard (acceleration from a stop). It felt like the same vibration was coming through the floorboard in general, so I wouldn't say this is specifically a problem with the gas pedal mechanism (what little there is).
I'll keep an eye out for it. I'm generally hypersensitive so it says something when I can't feel something. I was a loud voice on the FA forums about the quirks of the CVT (heavier engine braking at lower speeds, a 'release' sensation at 15 MPH, occasional 'grab' sensation when cancelling engine braking by hitting the gas, etc), figuring it was a problem. Turns out it was how the darn thing was supposed to work.