I can see them developing special chips for the iMac series, but not sure about laptops. The Macbook air im sure will just be a A14x with the pro's maybe getting a different one.
According to Gruman (Bloomberg) they're going to announce 13 inch Air, Pro and 16-inch Pro. I don't expect these would all have the same chip as the iPads. So we're likely to see some difference in the chips.
I'm guessing:
4 Big cores, 4 Little cores, for 13-inch Macbook Air
6-8 Big cores, 4 Little cores for 13-inch MBP
8-12 Big cores, 4 Little cores + dedicated GPU for 16-inch MBP
So probably 3 different chips, plus a dedicated GPU. So we may see 5 different major chips from Apple this year, although some may just be the same chips with some cores disabled, as it's common.

it will be interesting to see what extra grunt the M1 has in the Pro with it's active cooling and if the trade off is worth it. Personally I'm a huge fan of passive cooling.