Decided to dig through the editor on a hunch there might be - eeyup. Obviously not everything is here but some stuff to be worth posting. Sadly no campaign stuff it seems, all Allied Commanders, but cool stuff either way.
There are various "Cache" tooltips that unlock unit upgrades or unit production. Reaver upgrades are of course at the Robotics Bay, Dragoon and Zealot upgrades are at the Twilight Council. I believe these are from Allied Commanders, going by everything else. There's some for all three races, and upgrades are of course where you'd expect to find them (Dark Archon at Dark Spire, Sci Vessel at Tech Lab, etc)
Artanis is here with Dragoons and Reavers are promised, and he has Archons and Tempests along with the standard stuff. There's an upgrade called "Glory of the Daelaam," which increases maximum supply to 200. Two more abilities, "Swift Retribution," which instantly teleports him to the battlefield, and "Superior Warp Gates," which allow warp gates to hold three charges. Can has Shield Overcharge to give all allied units and structures +100 shields for 20 seconds, and can deploy a power field anywhere; allies can also use this field. He can all an orbital strike of five lasers, which deal 50 100 vs armored) area damage. He also has the following abilities via the Spear of Adun.
Guardian Shell: Upon taking fatal damage, units become invulnerable for a short time, preventing death. Unit cannot be protected again for 60 seconds.
Matrix Overload: Grants pylons the ability to energize friendly units in their power radius, temporarily increasing movement and attack rates.
Shield Overcharge: Doubles the amount of shields granted by Shield Overcharge.
Solar Bombardment: Performs an orbital attack, randomly bombing a large area and dealing massive damage. (This is a separate ability from the orbital strike ability mentioned earlier)
Solar Onslaught: Doubles the amount of shots fired during Orbital Bombardment.
Warp Harmonization: Enables Warp Gate research to affect Stargates and Robotics Facilities.
Here's Vorazun, her Allied Commander abilities are Black Hole, Dark Pylon, and Shadow Guard. Dark Pylons provide control and power and cloak nearby structures and units, Shadow Guard deploys 4 "elite Dark Templar" at target location. She also has Dark Archons and Corsairs, the former have Confuse and Mind Control and can attack air and ground units, the latter have Disruption Web. The Shadow Guard have an upgrade that gives them an aura called "Void Shroud," which stops enemy detectors from seeing them or other nearby cloaked allies. Dark Pylons meanwhile can be upgraded to have Recall. There's a "Veil of Shadows" upgrade that boosts the shield regen rate of units cloaked by Dark Pylons by 400%, and another "Strike from the Shadows" that boosts the damage cloaked units deal by 25% (works on all cloaked units, not just Dark Pylon-cloaked units). Finally is "Shroud of Adun" which boosts the shields of Dark Templar and reduces their vespene costs. She also has some help from the Spear of Adun:
Chronomancy: Reduces cooldown of Time Stop by 60 seconds.
Emergency Recall: Upon taking fatal damage, recalls friendly units to owner's primary structure.
Event Horizon: Negates armor of all units trapped by Black Hole.
Orbital Assimilators: The Spear of Adun harvests vespene from orbit without need for probes. Increases gas collection rate by 25%
Time Stop: Freezes all enemies in place for duration.
Enough Protoss, let's get Zergy with it.
Zagara's upgrades in Allied Commanders focus on, naturally, getting out lots of banelings. Swarmlings and Splitters are in, and she can upgrade Baneling Nests to periodically spawn Banelings on their own. She can spawn 4 Hunter Killers and fire Banelings at a target location with Baneling Barrage; an associated upgrade reduces the energy cost of the two abilities and increases the number of units they spawn. She can upgrade units to spawn broodlings on death, and Abberations to spawn banelings on death. She can also call down drop pods of roaches, with an upgrade to boost the number that spawn. Bile Launchers are unlockable, they're turrets that do area damage to ground and air units. Then "Mass Frenzy" boosts the attack and movement rates of all friendly units on the map for 15 seconds.
A big deal for her, Zagara normally has maximum 100 Supply, but her units train faster, cost less, and drones hatch in pairs.
Kerrigan has her Leaping Strike and Psionic Shift abilities from the campaign, and Assimilation Aura, which causes enemies nearby to drop resources on defeat for 15 seconds. Leaping Strike can be upgraded for range and power, too. She can upgrade Nydus Worms to Omega Worms, which cost no resources and upload units faster, and Zerglings into Raptors and Ultralisks into Torrasques, both of which work like in the campaign. Malignant Creep, Crushing Grip, and Fury also return from the campaign, but the second now affects units in a radius near Kerrigan. She also has an upgrade to gain life as she kills enemies.
Now we're gonna Terran up the thread.
Raynor can call in an orbital bombardment from the Dusk Wings. He can also call down the Hyperion for 60 seconds of ass-kicking, and it has Yamato Cannon, Advanced Point Defense Drones, and Warp Jump, and an ability to double its life to 120 seconds. More upgrades to it allow it to deal splash damage with the Yamato Cannon, and use its targeting systems to give nearby allies +2 damage. Remember MULES? Yeah, Raynor can upgrade to call down two at a time. Raynor's Barracks build 50% faster, and his infantry train 20% faster. As a separate upgrade, infantry have +15% attack rate by using Mercenary Munitions. Nano Projectors increase Medic and Firebat ranges by 2, and there's a universal Stim Pack upgrade to reduce the HP cost of using them by 50%. Orbital Depots return with Drop Pods, the latter working for the Barracks and Factory. Siege Tanks can be upgraded to change to siege mode faster and have +3 armor in siege mode. Finally, Banshees can be upgraded for splash damage and reduced cloaking costs.
Swann has an ability to boost the construction speed of mechanical vehicles and starships by 20%, and as part of that, Factories cost no vespene. A second upgrade gives Swann's mech units +20% life. He can also upgrade all passive turrets - "Devestation Turrets" gain range and slow enemies, Missile Turrets gain life and do area damage, and the cost of Perdition Turrets is halved. Swann can also call down a drop pod of 4 ARES warbots with 60 seconds timed life, with an upgrade to spawn 6 from the pod. Swann can also call in the Drakken Laser Drill which seems to function as it did in the campaign, a powerful laser with unlimited range. Not sure if unrelated, he also has another laser ability that does 400 damage to all enemies in a line across the map. Thors get Immortality Protocol again, and so do Siege Tanks. SCVs can be upgraded to build structures faster by assigning multiple SCVs to it, and as part of that upgrades, repairs have no cost.
Source:
http://sclegacy.com/forums/showthread.php?16248-LotV-Data-Hidden-in-Patch