Never heard this in my car..but I gotta admit to not really paying attention now like I was. After 10k with no problems I kinda figure things are fine unless it drives different...
I'll start listening for noises after shut off..... The noise in that video really did sound like a problem however if it doesn't happen all the time or even regularly...it could be it is just a fluke, or it could be a problem that is really hard to diagnose until it gets bad enough to be consistent. Either way only thing to do is to pay attention to how the car behaves under acceleration and deceleration in particular, but chances are if it doesn't make the noise all the time it isn't a big deal. My assumption when someone say's their car is making a noise is that it makes that noise regularly...all cars make weird noises every so often...so do most people....as long as it only happens every-once-and-a-while it isn't an issue normally.
@[email protected]'s comment about it happening after a short drive is interesting...does that sound normally happen after short drives, but not long ones? Could be as simple as something shutting off before getting fully lubricated, in which case the sound is normal in that circumstance...if the problem persists you should keep a notebook and make notes on what happened, how you were driving, the times you heard the noise to see if you can find a sequence of events that the dealer can replicate to try and diagnose the noise when they have it.