I took it in, and had a two techs, the service manager, general manager, and an SOA rep drive the car. They all said it felt fine, and there was nothing wrong. I took the car back, and within a day or two I got the same problem. It went on for a week where every so often the pedal would vibrate horribly after any acceleration over 3k in 2nd. Took it back, and drove with a tech. He said he felt "a little something" but it was around 530 pm so we went back to the dealership.
He said the service manager would call me and set something up since there were no loaners available. Its been two weeks since then. The problem had gone away, but tonight it happened again. I'll be taking the car in again soon to have it checked.
The clutch doesn't slip at all, I just get a horrible vibration in the pedal after hard acceleration.