A new report detailing the migration of Apple's Mac line to M4 is out, and it doubles-down on previous rumors that it's going to take a bit longer than a year for a Mac Studio or Mac Pro upgrade.

The Mac Studio and Mac Pro got their most recent refreshes at the 2023 WWDC. Fans of Apple's Pro desktops may be in for a wait if they want a M4 version.

In the weekly Power On newsletter from Bloomberg, there are a few more details. Specifically, the Pro-level Macs aren't expected until the tail-end of the M4 migration process.

And, that tail-end is still expected to take until the second half of 2025.

This is not the first time that this has been said. The most recent iteration of the schedule was in May, but it's been fairly consistent for about six months.

Apple's M3 chip debuted with Pro and Max versions out of the gate, at the October 2023 MacBook event. The M1 chip started at the base of the line, and worked their ways up to Pro, Max, and Ultra.

It took over a year for M1 to get an Ultra variant. The M1 Ultra debuted in the refreshed Mac Pro and then-new Mac Studio.

Apple's M1 and M2 chips in Mac Pro and Mac Studio had clear interconnects, so a chip like the Ultra was a clear possibility relatively early. The M3 does not have this obvious interconnect, so it's possible Apple had this road map in mind all along.

It's also not the first time a Mac has skipped a generation. The iMac went from M1 to M3 processor, for instance.

Relatively speaking, Apple does not sell that many Mac Studio or Mac Pro units. The company's flagships remain the MacBook Air and MacBook Pro lines — and it's not close.