I have a similar issue when accelerating. Same thing, in the 2500 rpm range, then it goes away after 3k. I thought something was loose somewhere, so at least this makes me feel a little better. I am going to take it in, just I it's documented and I get an official answer. Thanks everyone!
Definitely bring it in to your dealer and have them take a look. Then, to PM me with your VIN, dealer, mileage, full name, and best daytime number so I can escalate this to the customer service manager for your area.