This is a good blog post, with die photos of the new RP2350 chip and a brief description of what they show. There is a link to a 12 minute youtube video that is also very good, that discusses the die shots in more detail and also goes over the rest of the Pico 2 circuit board, including die shots of the QSPI flash chip and the voltage regulator chip.
If it’s like the Pico W, that will be like the regular version with a 3rd party wireless chip added, maybe even the same chip already used in the Pico W.
I’d like to see a Linux board in the Pico form factor, using Risc-V with appropriate MMU extensions, less powerful than a Pi Zero and hopefully still at the $5 price point. SIngle or double Risc-V core and 64MB of ram plus an SD slot makes a pretty nice embedded Linux board.
Good news! It already exists: https://milkv.io/duo