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Same problem here. Just updated to the 10.9.2 and no wifi hardware... Figured I'd update before heading out to read up on a few articles at the coffee shop and no no damn internet. What a joke of an update. I'm ticked... Why is this update still available if it's such crap? Figure it out apple. Geez.
 
Didn't think it was the hardware.

Yep, same issue here. Fortunately I'm on a MacPro so I'm wired in with Ethernet. I can just wait for a fix. I feel bad for you guys with MacBooks. :(
 
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