My guess would be a single M1 Ultra on a motherboard. Better PSU would allow for higher power draw. Combined with better cooling, possibly higher clocks, maybe a 24-core version and 256/512GB RAM support. Not sure how many additional lanes they have available for more memory/connectivity, but I'd imagine the usual - expandable storage, some form of discrete GPU for machine learning or something.So right at the end they said the "Mac Pro" is being left for another day. Any guesses as to what that might be? Two M1 Ultras on a motherboard then? Supposedly the Studio Ultra is already 80% faster than the previous top end Mac Pro.