Just looked at this list again now that the proper version is out. There is some real good stuff on this!
Some of my favouites...
Slight change of behavior for Attacks Of Opportunity. Now if have an invisibility effect applied (e.g. Invisibility, Sanctuary) you will no longer make attacks of opportunity.
Whirlwind attack will no longer leave you stuck in combat mode after using it. You will now also try to reaquire your original target after a Whirlwind attack (may not succeed if your target is now dead or gone).
Fixed an issue with size modifiers affecting your attack bonus when making Knockdown attacks. The size modifiers now only affect the opposed roll to resist the Knockdown attack.
Fixed some issues where the Darkness spell, when combined with Ultravision/True Seeing, could under specific circumstances incorrectly make you blind when your Ultravision/True Seeing wore off.
But this one is odd
Another change to AOO behavior. You will no longer take an AOO while you are using a healing kit.
Firstly, I didn't think you got an AoO in the current version anyway (last time I tried it that was the case). But if there is a fix, surely it would be to make it do an AoO (I mean trying to bandage yourself in combat - come on !!!)
This one is bad for my fighter, but good for mages (when I had a mage, this was a real pain - as the harder you were to hit, the more useless the shield spells became. In fact my mage used to take off armor braces and stuff so things could hit him!)
Damage Shields (e.g. Mestil's Acid Sheath ) now affect the melee attacker when the attacker hits the creature that has a damage shield (rather than only when they damage the shielded creature).