I can confirm item 1. Abandoned villages do not show on the map. You can click on them if you know where they are, and collect the items from it, but cannot see them. (Did not check the cloth map.)
Item 6, I don't remember seeing that parties of 4 was the minimum size now. Apparently you just cannot go below 4 members on any unit you train. Not sure I am a fan of that, it makes everything a lot more costly to train, which can hurt in the early game. Also I tended to like making single scouts for suicide missions ranging as far across the landscape, exploring, as I could; but if those are now groups, not sure I will want to waste that much in resources.
Also, maybe it was just the game I played, but where are the other Champions? I was 50+ turns into the game and had yet to see another Champion. The other sovereigns were already having children with their built in spouse, and I was still trying to find any champion.
And I will agree Tech research seems overly slow now. I have not played in a while, but it seemed to take a long time to get any tech levels.