Hmm, I also noticed that "abandon city" button. My guess is you get the # of workers you'd get if you had razed a city of that size... but it's just that, a guess.
I think I like the poprush changes. Religious is still a great trait, you just have to wait 10 turns before poprushing a temple now... and, well, a new city often needs 10 turns to hit size 2. So I think it works out fine for me.
How about the corruption changes (courthouses/police stations/wltkd)? I don't think it will have a major effect, in that it seems the optimal number of cities is really the big factor by the time you're in a democracy with ch's and ps's everywhere. I like it, though. I was ok with corruption as it was, so a relatively minor change is fine by me.
How about the vague notation about changing AI tech trading? I wonder what that boils down to. That should effect strategy.