Spirit Blade's damage was heavily nerfed, and you now choose between one of two upgrades.
Unforgiving Chain now increases crit chance by 2% per hit instead of 1%.
War Horn's upgrade doesn't smash guard anymore. Instead, it removes the cooldown entirely and grants increased effect the longer you wait between uses.
It'll Cost You now returns 50% damage instead of 15.
Unbowed no longer exists. In its place is Livid, which boosts your damage and damage reduction for each nearby enemy. The upgrade gives you 20% guard for each enemy. FT Volcanic Aurum still makes reference to Unbowed, however.
Mark of Death got a duration boost. The upgrade boosts its duration further but removes the bonus damage from manual triggering.
Flask of Lightning's upgrade now zaps every enemy you damage for 300% electricity when it runs out.
Walking Fortress' upgrade no longer reduces cooldown times.
Spike Trap offers a choice between one of two upgrades.
Quoted from another forum
UPDATING WITH ALL CURRENTLY KNOWN INFO.
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
Throwing Knives - Fixed issue. Now does 25% weapon damage per strike with upgrade.
Hidden Blades - (thrown dagger actually tracks enemies)
Mark of Death - Upgrade adds 4 seconds of longer duration to a total of 12 seconds, 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 - "And Throw Everything" upgrade adds 125% damage to all mines. Also has a random chance to throw a larger mine.
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)
Winter's Grasp - New upgrade inflicts 1000% more damage to enemies already chilled or frozen.
Blizzard -New Upgrade removes sustained mana cost
Ice Mine and Fire Mine - New upgrades casts 2 of them in front of your self.
Wall of Fire - New upgrade
Immolate - Reduced the mana cost of the base spell to 25 mana.
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 som