Interestingly, Apple apparently confirmed to a French website that M4 lacks the interconnect required to make an "Ultra" [0][1], so contrary to what I originally thought, they maybe won't make this after all? I'll take this report with a grain of salt, but apparently it's coming directly from Apple.

Makes it even more puzzling what they are doing with the M2 Mac Pro.

[0] https://www.numerama.com/tech/1919213-m4-max-et-m3-ultra-let...

[1] More context on Macrumors: https://www.macrumors.com/2025/03/05/apple-confirms-m4-max-l...