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The management engine can talk to ethernet cards directly, without using PCIe or the OS, via SMBus, look at the thing labelled "SMLink0" on Figure 5-2 on page 38 of http://www.intel.com/content/dam/www/public/us/en/documents/...

Indeed, the ethernet controller's datasheet that shows that it can send ethernet traffic over SMBus: http://www.intel.com/content/dam/www/public/us/en/documents/...

Is there something similar with wireless LAN cards?

Yup. It's the 'vPro' option on Intel wireless chips.

I'm pricing out a Thinkpad T570 and they gave me this choice: http://i.imgur.com/M7OShL6.png

I wouldn't take it even if it's free.

Dell actually charges you for adding vPro.

Even if the ME talked directly to WLAN cards, maybe it wouldn't be as straightforward as a physical link Ethernet connection would. 802.11 is complicated and more involved, by comparison.

Anyone know if Intel phones are affected by this bug?

Phones don't use Core chips, so almost certainly not.

Signally distributed blocked gophers

Intel AMT on wireless networks