I've experienced the same thing and I dug up the answer that I found previously.
http://986forum.com/forums/general-discussions/2485-tiptronic-tranny-hesitation.html
03box said "Hey guys I stopped by the dealer today and talked to the service director and he said that what I am feeling is the vario-cam. He said this issue comes up all the time. He said the reason I only feel the change in 2nd gear is because the torque load on the engine is totally different than 3rd,4th,etc. He also said that for some reason it is more noticeable in tips than in manuals. He said the cam is moving to a much higher lift to gain extra HP. I have had two dealers tell me the same thing."
Seems like a normal occurrence on these motors/transmissions so nothing to worry about. As far as the transmission slipping in between 4th and 5th I've had this happen to me a few times as well. The car tries to shift then the rpms rise while the car coasts then it finally makes the shift. It has only happened to me a few times in almost 2 years. This may be caused by low levels of transmission fluid so you may want to check that if it was never done before. My car has not done this for a very long time and I never touched the fluid level however. I have noticed if I try to accelerate the moment the car selects a higher gear it acts a little odd but that makes sense.
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