Wii U Hardware/BCM43362
The Wii U features a Wi-Fi chipset from Broadcom, specifically the Broadcom 43362.
This Wi-Fi adapter is connected over SDIO on SDHCI1, on the Latte SoC. Unlike the BCM4318 which it replaces, it's actually reasonably performant.
Compatibility
linux-wiiu has preliminary buggy support for this card. NetBSD supports it well.