I bet, I heard someone here while back say that 3.5s are noisy when cold but don't know if it's the same noise. I don't know if you get normal service done at the dealer but if so I'ld have it checked then or if you take it in for the recall, The worse they can do is call it normal operation.
Well, it is more so when it is very cold. I have only owned the car since Oct. 13th, so I have only had it in colder weather. The whine is still very annoying. I usually let it warm up more in hopes that it will go away.