I have been informed that the Wifi only runs at 2MBit/Second which is not the end of the world, and that it supports several encryption standards (not built into the Wifi chip, but in software before data reaches the chip).
The Wifi chip is on a daughter board and has shielding around it. It appears that the daugherboard connector is10-pin, single edge thing.
Daughterboard with all the shielding
Daughterboard with shielding removed.
The Broadcom BCM4318E is the baseband chip (the one the Wii communicates with). Right now, I'm trying to get the pin-outs on it...