> high-speed 250 MHz 8-bit DDR PSRAM with concurrent flash and PSRAM access

This is perhaps lost in the noise but IMO a large deal. PSRAM starting to get serious bandwidth.

For reference, the 4-bit PSRAM interface on the ESP32-S3 normally runs at 80 MHz (maximum 120 MHz) and shares bandwidth with the external flash.

I wonder if it will be possible to (ab)use the faster PSRAM interface on the ESP32-S31 as a general purpose 8-bit parallel interface, eg. for ADCs...