From the 10.2.6 data, we've datamined what appears to be spells from old iterations of Plunderstorm — class spells, vending machines, air drops, and a Shared Drop Vehicle!
In an old iteration of Plunderstorm, Plunderstorm may have been in the lore as a tournament. Many spells seem to reference this as a tournament:
In the release of Patch 10.2.6, many «new» class spells were datamined that follow the same format as current Plunderstorm spells. It seems at one point, Blizzard may have tried to do class spells for Plunderstorm before moving to the general abilities system. Here are a few examples, but there are utility spells listed for every class.
Anti-Magic Zone
Darkness
Alter Time
Many other Offensive spells have been found in the data which are likely old. Many reference Spell Power (SP), when all of the current abilities use Attack Power (AP). Some seem to be class inspired while others are more general. Here are some examples:
Arcane Storm
Arcane Storm, Arcane Storm, Arcane Storm, Arcane Storm
Arcanosphere
Arcanosphere, Arcanosphere, Arcanosphere, Arcanosphere
More Examples
Blessed Hammer, Dark Star, Fast Time,