This is odd, I don't get why so many people are saying they see big improvements, maybe I just happenned to have encountered crappier AI, because I have not noticed very much difference at all, maybe marginally higher survivability, but it's close.
AI still does stupid things, it still seems to attack towers at bad times, had an AI Reg on my team spend the entire time chasing angels and other things like that. He also didn't run when the enemy Beast and Oak were approaching, basically dying 10 times in a row before the game ended, even though the player had several kills and assists and 0 deaths when he disconnected, and was decently geared up.
The Ai has like 3100 health in late game which really isn't enough. I don't ever see it as a threat offensively either. Rage Quitter is still practically auto-loss, even after the updates.