So from the patch notes, I would think, the Quest "Unidentified Flying Object" will be for the proto Ultima fight.

As you can read in the requirements, it seems to be part of the Mhach quest chain.

"Players must have completed the quest "Freedom for Our Skies," and have unlocked the alliance raid Dun Scaith."

Any idea how proto Ultima fits into the Mhach lore?