The best thing I've noticed is that Ai and especially Barb cities are now built in much more sensible places...my first game (huge / monarch / marathon) I'm up to 17 cities and half of them are Barb built (thats if you count Saladin as a Barb too
) (and N.B. I don't have COL or Currency or a religion yet, even as Otto, this will test my city spam strategy to the hilt...)
Also they don't seem so hellbent on building 3 tiles away from your own established cities, when the resource they are aiming for is yours now, has been for ages, and for practical purposes always will be. It no longers seems to just see some Silk (for example) and build a city with no chance of ever having it (as it belongs to someone else as said above). This also lessens early "our close borders" penalties.
One thing I HAVEN'T seen (which was promised) is Barb spearmen. None whatsoever, and believe me I've already defeated literally over a hundred barbs.
I'm not sure still about the promised AI using slavery effectively. I approached one of Saladin's cities with 5 well promoted chariots, he had only 1 basic archer (obviously suffering from the hideous amounts of barbs I was too), and even though the city was size 4, he didn't whip out another defender, which to me is by far the best time to whip, as in there's no way to whip when you've lost the city, which of course he did
Anyways, just some early comments on 2.08.