An interesting find! I got my hands on a Raspberry Pi 4S, which is the most powerful module in the CM3 format. It isn't available for retail customers but somehow a store in Denmark had 4 of them in stock
And today it arrived! Broadcom 2711 MCU with the C0 stepping (same as RPi 4B which can run at 1.8GHz) with 32 GB eMMC (Samsung KLMBG2JETD-B041) and 1 GB LPDDR4 (Samsung K4F8E3S4HD-MGCL).