Ah, PITB It's been worked on with bunch of people on VORON Discord, concentrated around Party In The Back thread (hence the name). It's a CAN board which sits at the back of gantry and powers A&B motors. It has 5160 which can be powered with 48V. It simplifies wiring, fully utilizes CAN bus - you run fewer from main MCU, then from this board you run just 4 wires to CAN board on the toolhead. You can then have much leaner MCU for Z drives and heated bed.