The answer was finally revealed and it was a surprising one:



The Devs have ignored every request to add Omega Supreme and Overlord to the game for 2 years now, so everyone assumed this would never happen.
But they are on their way to the game soon!

The backstory too is interesting, it looks like it was sourced from Transformers Animated, they've never used that material before in the game.
According to the initial dialogue, Omega Supreme was reported dead at the end of the Great War, but rumors were that he'd actually left the battle to travel away from Cybertron, carrying the AllSpark within him to safeguard it
The only one who knows the truth is Chromia and every time she was asked about it, she always refused to answer with anything other then direct denial.
According to the end of the scene, Chromia knows how to find Omega Supreme and they are bringing her to Earth to find him again.

And as requested, here is my modular spear set with paddle heads: