1. the AI is really really slow with the early wonders and religions
2. the CS slinger is really strange
3. one can be more of a builder; for example, in my current game, I'm playing Huana, medium seas, epic speed. khan was my only co-inhabitent. he went the way of whomp's hair very early. so I had to burn to optics. when I got there, everyone else was somewhat ahead. So I then burned to demo with a few detours. Some of those detours involve castling my cities. Now I've got cities with 4 trade routes spewing gold. IIRC, one trade route was +11. This is a very wonder light game. it is about 1800, and I haven't been invaded; on the other hand, I haven't tried to invade.
4. it seems to be easier to tech trade yourself back into the mix
1. I'd disagree. I think they're just as quick (maybe a little quicker), and they seem more random as to whether they pursue Buddhism or Hinduism out of the gate. It used to be that Hinduism was pretty much guarenteed to me if I started with Mysticism (all the AI's seemed to go to Meditation first). This doesn't seem to be the case anymore.
2. What do you mean "really strange"? They modified the Great Prophet's tech pop priorities, so you can't avoid Masonry and use a GP to pop Civil Service (maybe that's what you mean).
3. I always play with Aggressive AI, but I can't say I see any change in the AI's willingness to war post patch. Then again, I work pretty hard at not being somebody's target -- it's rare that somebody ever declares war on me, unless I've been "grooming" them to do so.
4. Again, I don't see much difference here post patch. But I think the AI's have a modifier that makes them more willing to trade a tech as more players know it (meaning that if an AI has a monopoly tech, they tend NOT to trade it). With all the AI's teching better, the tech race is closer, monopoly techs don't last as long, and more trading may be taking place.
Aelf makes (and keeps making, and keeps making

) a point that the direct improvements to the AIs economy and teching abilities have made it a more formidable "builder" opponent. But there have been no direct military improvements, and the economy and tech improvements only indirectly help the AI to warmonger, so it hasn't become a better warmonger.
I haven't decided yet whether it bothers me much though. I went from playing Monarch to Prince, but haven't really change my style of play any.
Then again, I've always thought that it should be impossible to win without taking over (at least) one other Civ. They may have solved that now -- at least for higher levels.
But you shouldn't be able to win by maintaining a stance of nearly constant war, either. I don't think they've solved that yet.