Hi VJ. I used to be very tuned into the Apple rumour sites, but I did not see much speculation about larger screen Macs. There is some speculation about Apple putting a Mac inside a keyboard.

https://www.macrumors.com/2022/02/25/apple-explores-mac-inside-keyboard-device/

But then I found this: https://www.macrumors.com/2022/01/03/high-end-imac-to-come-in-multiple-colors/