I don't know about the 2011 models, but my 2008 535 has a key slot. Thing is, it doesn't charge the key. Comfort access uses a replaceable battery, non CA models charge the key.

If CA is standard now, they wouldn't need a key slot.

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue