Early in a game I attacked some spiders with only my hero and champ. The attack went horribly wrong so when both were poisoned and had only 2 or 3 health points left I clicked on fast end to start a new game.
To my surprise I had won! If I had continued this battle manualy I couldn't have won even with the best of luck ever.
Next game my damaged hero fell in the darkling quest and his lone level 1 champ buddy remained alone, near death from a battle the round before, then blinded and cursed from the shaman, armed with the weak ice staff (4 points of ranged damage). Two nearly undamaged darkling hordes were only two hexes away from him, giggling over my foolish attack, when I couldn't bear it any longer to watch this horrible drama and hit fast resolve... Naturally, I won again.
Perhaps the fast resolve button froze the darklings in place? Or the tactical AI on hard doesn't play with the best algorithms as mentions in the mouse over?
Speaking about the "hard" AI: heroes with pioneers stacked remain standing around in the same place for over 30 turns and build only one city when there is place enough to build 5 more. Even when I cleared all monsters around them to make them feel more secure they didn't. I had 7 cities by then and stopped playing (save available).
Don't get me wrong, the other ballancing changes are all great and "expert" is now a very satisfying gaming experience, if not for hardcore strategists. But "hard" should be renamed "lethargic AI withourt any desire to win". Let them spam pioneers again!