https://www.raspberrypi.com/products/rp2350/
4 variants? "A" and "B" variants in QFN60 and QFN80, "2350" and "2354" variants with and without 2MB Flash. CPU can be switched between dual RISC-V @ 150MHz or dual Cortex-M33 @ 300MHz by software or in one-time programming memory(=permanently).
Datasheet, core switching details, most of docs are 404 as of now; I guess they didn't have embargo date actually written in `crontab`.
e: and datasheet is up!