Seems like they're preparing a new part of Time Temple.

It is Freed and Afrien. The whole Mercedes promo is shown right when you create the character. After the huge bang at the end, Mercedes wakes up beside the two she was fighting with. Their names are Freed and Afrien, it's written right underneath them.

So we're just gonna ignore the fact that the video clearly takes place in the Temple of Time?

Being shown right after you create the character doesn't necessarily indicate a chain of events.
They shoved a TV commercial into their game.