Nothing about the wifi card?? Is there a wifi card or its also solderd to the board?

The mic is probebly for Siri as in iphone use the upper mic for siri and not the "talking" buttom mic.

What those ics responsible for?

Does anybody know if it is possible to add an additional disk to the 21.5 late 2013, 14,2 model?

Does this model also have the SSD slot as the discussed model?