Went through the thread and compiled everything that everyone has noticed. I also checked in-game myself (PC) and it all seems to line up. Thought it would be nice to have a list of everything so far.
Rogue
Unforgiving Chain - Critical Chance 2% instead of 1%
Deathblow - Double Stamina cost fixed?
Spinning Blades - removes any debuffs on target
Evasion - Dodge Chance 10% instead of 5%
Shadow Strike - Regain 70 Stamina if hit enemy wasn't targeting you, costs 20 stamina, hits harder in stealth/if not damaged recently
Hidden Blades - (thrown dagger actually tracks enemies)
Mark of Death - Upgrade adds longer duration and still sunders armor, but no more manual triggering,
Flask of Lightning - Upgrade adds 300% lightning damage to hit enemies when it ends, still slows time 99%
Spike Trap - Upgrade choice - bleeding or larger AoE (might be bugged, not showing up for some)
Elemental Mines - increased damage? tooltip not updated though
Warrior
War Horn - No more Guard damage or Sunder, upgrade gives better effect the longer you wait between uses (Snare, Fear, Stun), might be bugged
Horn of Valor - Base ability and upgrade only give 15% bonuses each (max. 30%)
It'll Cost You - Damage returned is 50% instead of 15%
Livid - formerly Unbowed, Damage Resistance and Damage Bonus for each enemy nearby (max. 5), upgrade adds Guard as well
Ring of Pain - does Spirit damage now
Walking Fortress - Upgrade no longer reduces cooldown, adds Guard when enemies hit you
To the Death - (not as effective in some way, enemy damage outpaces Guard?...)
Mage
Barrier - stronger effect but decays faster
Rejuvenating Barrier - Mana/Stamina regen for everyone under a Barrier
Static Cage - only paralyzes, does less damage now with upgrade
Mana Surge - activates for anyone who's Barrier pops (freeze and free skill)
Walking Bomb - Explosion damage 500% instead of 600%, should actually be doing the 500% instead of 200%
Spirit Mark - Upgrade damage 100% instead of 75% for total 175%
Spirit Blade - Damage down to 150% weapon, and 100% for Guard/Barrier, upgrade choice - faster charge build up to expend them all or reflecting projectiles (might be bugged, not showing up for some)
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With all of these kinda changes, I may just revert all my characters to their "post-Black Emporium final face" saves so I can get used to all the skill changes and try out new ones. Can some other people confirm if Deathblow is fixed now, and double check what I have here for all the skills?
EDIT: So it seems that Deathblow does work properly now, AVPen?