It does have Keyless Start and Stop, if you go back and look at the first Interior pic, to the left of the shifter you will see 2 buttons, the big one is Start and the little one is Stop. I've just always used a key on everything else I've owned so I just automatically put the key in.
Taken from the spec list:
"Advanced Key, keyless entry and go system. Includes proximity sensor in door handles and trunk lid and Start/Stop button in the right upper corner of the MMI terminal.
Allows for selective unlocking of doors and trunk lid, starting and stopping of the engine, and locking the vehicle without taking hold of the key.
Key has to be within 60 inches (1.5 m) of proximity sensor to unlock vehicle and in the driver's cell for starting the engine."