High potential for new favourite MCU

If you know the nRF54L15 already, its all of that + High Speed USB, 2MB RRAM (NVM), 512K SRAM.

If not:128 Mhz ARM M33, a 128MHz RISC-V co-processor that can do software defined peripherals (written in (C) code) and the usual excellent BLE and other 2.4GHz radio stuff while being extremely low power.
Price wise also fairly cheap at 2.5€ in singles (much less in high qty).

Even if you ignore the wireless this is a neat part.

Also one of the few high end BLE parts that are still coming in QFN (normal QFN, not the weird QFN from nRF52 times).
While most wearable want WCLSP, for more normal stuff QFN is great to have as cheaper to implement option if you don't want to go with a module.
@timonsku yes! Nordic sent me a sample a while back, and I'm itching to get ZMK updated to new enough #zephyr that we can use it.