Since I'm a serial replayer (not even finished act II with any party yet) I'm ideally placed to notice that there seem to be some interesting AI improvements in 1.04.

 

In one area a load of beetles marched round several corners to come and attack my party from behind whilst they were attacking some spiders. Never expected that!

 

Also a bandit/looter crossbowman in the same map ran away at 'Near Death' and healed himself, so even after I killed his pals and ended combat, he was waiting around the corner at full strength for a new combat. Personally, I'd have run away completely since he lasted about three seconds...but still, small tweaks like this are definite improvements (if indeed this is down to patch 1.04, which I'm not sure, it's just the first time I've seen such things)

Edited April 17, 201510 yr by sim-h

I've had Lions and Wolves stalk my party before, so it may not be due to the 1.04 patch. However, it may be a sign that the devs are putting some serious work into AI tuning.