I own an M1 Macbook Air. At its hottest, it's a fraction of the "normal" heat that my year old Intel based Macbook Pro runs at.

To get the M1 warm, I need to be charging it while also playing an Intel based game like the latest Subnautica, with the machine on my lap. Even then, it's not as hot as my Macbook Pro gets while unplugged and browsing the internet.

No. According to rumours: the high-end 64-128 GPUs will be exclusively for the Mac Pro and the MacBook Pro will have 16-32 cores GPUs instead. It think it's fair to assume that we won't see much changes with the cooling for their laptops.