Optimus Prime's - Maker, Quintessa?

Gemma Chan, Humans, Robots, Transformers: The Last Knight

Rumor has it, Gemma Chan, of AMC's Humans, is Quintessa - Optimus Prime's 'Maker' in Transformers: The Last Knight.

Is it just Optimus Prime, or all the Cybertronians? I get the impression, Quintessa, is probably going to fill a sort of Primus, role in the movie-verse.

Good casting, regardless.