The SparkFun Pro Micro board (SparkFun part number: DEV-17717) has been retired by SparkFun Electronics. However, this does not appear to be the end of the Pro Micro RP2040 as a newer version (DEV-18288) appears to be it’s successor.
There is no available stock of the updated part and SparkFun’s datasheets, schematics and GitHub repos are all reference the old version. However, new (or at least different) product photos have been used on the product pages. We will keep you updated as soon as we can confirm what changes have been made.
A simple explanation of the new revision could be the ongoing problems with chip supplies worldwide causing SparkFun to replace components that they are struggling to source. This is currently unconfirmed.