I have the exact same noise under 20mph, but it goes away once the car is warm. I was planning to make an appt at the dealer, but by the time I get there the noise would be gone.
Anyhow, thanks for this. I thought it was just me being listening more closely since the warranty is almost up. Doesn't the dealer check fluid levels during oil changes? The sound became more apparent after my last service which was a few weeks ago.