The Raspberry Pi Pico W is an update to last year's Raspberry Pi Pico using their in-house RP2040 silicon . The Pico W is a small update to this IoT platform that has already sold more than two million boards.
Raspberry Pi Pico W
With the Raspberry Pi Pico W, there is now 802.11n wireless networking added to the Pico platform to make it more attractive for IoT use-cases. The Pico W retains pin compatibility with the original Pico. The Pico W makes use of an Infineon CYW43439 wireless chip.
Aside from the addition of 802.11n wireless networking, the Pico W is the same platform as the Pico. Rather than $4, thi 802.11n WiFi variant will sell for $6 USD.
More details on the Raspberry Pi Pico W at RaspberryPi.com .