Changing the 13" MBP from the M1 to the 8 core M1 Pro would make perfect sense as a cheaper pro machine. Releasing systems with the M2 in March when Apple still sells machines with Intel processors just doesn't sound very Apple.
Actually.... this isn't such a bad idea.
I don't think they'd keep the 1300 bucks entry price. But it would make sense at 1500 with 256/16 (they technically could even make it an 8G machine if they really wanted, but that would artificially gimp the SoC and 8G really isn't very "Pro"). Don't need the ports, Mini-LED and bells and whistles? Yeah then that's not such a bad deal. (I would be such person, for example).
And yes, you could fit the M1 Pro on a board that would fit into the current chassis, and no, battery life wouldn't be the killing blow to this design. The M1 Pro doesn't draw significantly more power than the M1
as long as you don't do things that you would need the M1 Pro for. Just browsing the web, watching videos, heck even working with Logic wouldn't change a lot about battery life. But you'd have the additional computing power if you needed it. You just couldn't sustain it as long on battery, but well, that's why you'd pay 500 extra bucks for the 14 inch, and that's why they would limit it to the M1 Pro - no Max.
And it would make kinda sense if Apple planned to phase out M1, but, for obvious reasons, would need to keep making M1 Pro / Max for some time. They keep the "cheaper" Pro model around, while they replace the MBA and Mini eventually.
I still believe the next MBA will actually just be the MacBook, no more Air, and that the low-spec Mini will eventually vanish again. There hardly is a market for a low-end headless desktop device since people using an extra display usually use them for actual work or semi-professional stuff, and as such (at least in Apple's mind) are willing to pay pro bucks for that kind of device. People that just want to browse the web, watch videos and type up a few notes are supposed to buy the iMac or MacBook, not a device you need an external screen for. The only reason the M1 Mac Mini exists is because they wanted to give those people "something" back when M1 Pro was still a mile away.
So with the MacBook NoPro on M2 eventually (still think we're looking at October/November here) and the Mac Mini not being a NoPro machine anymore keeping M1 around "just" for the entry-level Macbook Pro wouldn't be financially feasible, especially not if they also present a new iPad pro also on the M2.
Yes... THIS makes sense. The one thing that still doesn't compute is keeping the touch bar around. But, fair enough: that already made no sense with the current iteration. So maybe they just keep it for those folks that really like it. At least for one more generation. Who knows.