The MBA, 13inch MBP, the bigger imac and the mac min are all old designs that were updated with a M1 processor.

The 2022 update will bring a new industrial design on top of the new architecture. The same way the imac and the 14/16MBP were refreshed with a new design + a new architecture.

My predictions form each:

- MBA -> many colors, white screen/keyboard background (similar to imac)

- MBP 13 -> renamed MacBook, a MBA with more ports, no colors and black screen/keyboard

- iMac -> might be renamed imac pro, black screen and keyboard background. Same small footprint as the consumer imac

- mac mini -> the current mac min is pretty empty. I think we'll see something much more compact but really similar in design.

EDIT: style