Yeah mine does the same as well during cold mornings. Mostly its because the compound in the brake pads need time to head up, coupled with moist cold air oxidizing the rotors, creating a thin layer of rust on the rotors. Slow speed braking creates a minute amount of chatter and vibration, causing the squeak. It's just something you have to deal with. Even with ceramic pads will do the same. Atleast with OE pads, the initial cold bite is very good. Ceramic compounds in extreme cold almost feel like a pad soaked in water. When you give the first brake, theres no bite because there is no heat.

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2011 E70 50i M Sport