There is at least $400 USD that is unaccounted for, if you look at the current Mac Studio price since it is still on M2 Max.
In the M3 Max MBP release, the upgrade price from M3 Pro to M3 Max has increased (if I recall) $300 due to the SoC change. Then the upgrade from binned to full M3 Max also added another $100. This pricing structure has carried over to the M4 Pro Max MBP. Memory wise it is also unclear if the Studio will be like the MBP, locking certain RAM configs behind only the full SoC.
Also it is not totally unlikely that the M4 Max / Ultra Studio may need some change in its chassis I/O, since the mini has now been made a bit closer to it. I am in a similar situation as well and my line of thought is this: assuming a WWDC announcement, July ship date, a month of waiting for reviews or BTO delays, we are looking at a conservative date of August 2025 to get my hands on a M4 Max Studio (not considering the M4 Ultra). And between now and August do I absolutely need a M4 Pro mini around? Answer is a flat no, I have a M1 Max Studio still kicking. But everyone's case varies.
In the M3 Max MBP release, the upgrade price from M3 Pro to M3 Max has increased (if I recall) $300 due to the SoC change. Then the upgrade from binned to full M3 Max also added another $100. This pricing structure has carried over to the M4 Pro Max MBP. Memory wise it is also unclear if the Studio will be like the MBP, locking certain RAM configs behind only the full SoC.
Also it is not totally unlikely that the M4 Max / Ultra Studio may need some change in its chassis I/O, since the mini has now been made a bit closer to it. I am in a similar situation as well and my line of thought is this: assuming a WWDC announcement, July ship date, a month of waiting for reviews or BTO delays, we are looking at a conservative date of August 2025 to get my hands on a M4 Max Studio (not considering the M4 Ultra). And between now and August do I absolutely need a M4 Pro mini around? Answer is a flat no, I have a M1 Max Studio still kicking. But everyone's case varies.