Yeah, I guess that's another rumor, that the iMac sizes will move up. 32" 6K makes sense for the new large, with maybe a 25" 4K as the smaller size.
I'm cautiously optimistic, just kind of feels like an Apple play, all new FF, etc., while keeping other things the same.
That being said, there's that "M1X" that was ID'ed by a couple of CPU comparison sites, basically double the CPU/GPU cores (the CPU is suggested to be 12-core, since it's only doubling the performance cores, 4 + [2 x 4]).
Heck, I guess the M1 machines have been out for like 6 months, that seems like a reasonable timeframe to offer a new M1, and the existing products were always the "entry level" (I use that loosely given their performance), iMacs __should__ be faster than the 13" laptops.
What I'm excited about is the potential for this new M1 to go into a Mini, if they reveal an M1X iMac tomorrow, and it goes on sale immediately, I can't imagine there not being a revised M1X Mini out soon. A 16/16 core Mini, with 32 or 64GBs of RAM, and 4 ports? Yes please
That would solve the primary issue with the Mini, the pretty lackluster GPU performance.