So I received my new M3 Pro MacBook Pro a few days ago in Space Black. I was so trepidatious about the keyboard and trackpad that I'd been putting off opening and using it, after so much hassle with the M2.
But the news is really good! The trackpad feels much better than the Midnight M2 Air I had. There's much less friction and it's much more pleasant on the finger.
The keyboard is also clearly improved. It seems to have been redesigned slightly. The keys are much more accurately placed - the backlight shining from under the keys is much more consistent from key to key, and it just looks really sharp and well made. The keys don't wobble as much. The feel of the keys feels more consistent and satisfying than before, too. I'm not missing keystrokes as much and the keys actuate properly.
Let's hope they bring these improvements to the M3 Airs next year! For now, I'm finally a happy camper.