Patch is now in and leaked notes were right on spot:
Engineer:
Jump Shot: Increased the radius of the second attack from 120 units to 240 units.
Jump Shot: Decreased the aftercast on this skill so that other skills can chain off of it more easily.
Jump Shot: Cleaned up the movement on this skill so that it will more accurately move to the target location.
Tool Kit: Smack and Whack now each apply 2 stacks of vulnerability instead of 1 stack.
Rocket Boots: This trait now shoots the player forward and doesn’t inhibit the player. Reduced the cooldown to 20 seconds. This trait is no longer a stun breaker.
Rumble: This ability now breaks stuns. Added 1 second of stability.
Static Shield: The Static Shield buff is now removed if the player cancels this skill. The buff is no longer removed when the player blocks a melee attack. The stun duration has been reduced from 2 seconds to 1 second.
Throw Shield: Projectiles from this skill no longer passes through walls.
Blowtorch: Reduced the aftercast from .65 seconds to .4 seconds.
Fixed an issue that allowed engineers to execute back-to-back heals by using the underwater transition.
Elixir X: Reduced the cooldown to 105 seconds.
Elixir U: Reduced the cooldown to 50 seconds.
Launch Ice Mortar: Reduced the cooldown to 20 seconds.
Launch Personal Battering Ram: Reduced the recharge to 15 seconds.
Personal Battering Ram: Reduced the recharge to 25 seconds.
Analyze: Reduced the recharge to 30 seconds.
Throw Napalm: Increased the burn duration to 5 seconds.
Harpoon (Harpoon Turret—Tool Belt): Decreased the cooldown to 10 seconds. Increased the damage by 25%.
Surprise Shot (Rifle Turret—Tool Belt): Increased the damage by 33%.
Rocket (Rocket Turret—Tool Belt): Decreased the cooldown to 30 seconds.
Elixir U: This ability now functions correctly with Potent Elixirs.
Elixir R: This skill is no longer a stun breaker. Decreased the cooldown to 30 seconds.
Super Speed: This skill now breaks stuns.
Slick Shoes: The effect for this skill now actually displays.
Grenade Kit: This kit no longer destroys itself 6 minutes after being equipped.
Net Turret: Fixed an issue where spamming Net Turret would allow it to fire the electrified net three times in a row.
Alchemy
Acidic Coating: This trait now applies blind instead of poison to the target for 3 seconds, on a 10-second recharge.
Backpack Regenerator: This trait has been reworded so that it doesn’t imply that it adds the regeneration boon. This now scales with healing power from 125 to 192 (1500 healing power).
Explosives
Acidic Elixirs: This trait now removes a boon when they land, in addition to dealing damage.
Autodefense Bomb Dispenser: The internal cooldown of this trait has been reduced to 30 seconds.
Firearms
Knee Shot: This trait has been merged with Sitting Duck.
Sitting Duck: Inflicting immobilize on an enemy also cripples them for 5 seconds and applies 5 stacks of vulnerability for 8 seconds. This effect can only occur once every 5 seconds.
Fireforged Trigger: This trait has been moved to the Adept tier.
Juggernaut: This trait has been moved to the Master tier.
Coated Bullets: This trait has been moved to the Master tier.
Napalm Specialist: This trait has been moved to the Grandmaster tier. The duration of burns that the player applies has been increased by 33%.
New Grandmaster trait—Modified Ammunition: Damage is increased by 2% per condition on the target, when wielding a pistol or rifle.
Inventions
Stabilized Armor: Reduced the damage by 20% when the player is knocked down or stunned.
Elite Supplies: This trait now improves mortar range.
Tools
Always Prepared: This trait now only drops bandages when the engineer is downed (10-second cooldown). Damage while downed is increased by 25%.
Packaged Stimulants: This trait now improves the effectiveness of the thrown medkit by 25%.
Scope: Critical chance is increased by 10% when the distance to the target is greater than 600.
Leg Mods: The duration of crippled, chilled, and immobilized has been reduced by 33%.
Armor Mods: This trait will now grant aegis for 5 seconds when critically hit. This effect has a 25-second internal cooldown.
Inertial Converter: This trait now functions with the underwater versions of Toss Elixir B and Toss Elixir H.
I think this song sums up our day now
http://www.youtube.com/watch?v=WrwhfhncPfM
(edited by Penguin.5197)