Raspberry Pi have today launched the $6 Raspberry Pi Pico W, which brings 802.11n wireless networking to the Pico platform, while retaining complete pin compatibility with its older sibling:
It incorporates the Infineon CYW43439 wireless chip. The network stack is built around lwIP, and uses libcyw43 to communicate with the wireless chip.
I hope to have support for the Raspberry Pi Pico W networking added to uLisp soon.
For more information see: Raspberry Pi Pico W: your $6 IoT platform.