Yes, experiencing the same thing. There's a "Squeaky Break" thread in the Wheels forum - the key thing to try is rebedding the brake pads. Make a couple hard decelerations from 60 to 80 mph, then cruise a bit without touching the brakes to allow the pads and rotors to cool a bit.
Current: 2013 Monte Carlo Blue F10 M5 (ED on 9/1/12)
Previous: 2009 Carbon Black E60 M5, 2006 Silverstone II E60 M5, 2003 Sterling Grey E39 M5, 2000 Anthracite E39 540i6, 1998 Jeep Grand Cherokee 5.9 Limited, 1990 Eagle Talon TSi AWD, 1978 Mazda RX-7