It doesn't have to showcase anything new. They may as well talk about the development of this MASSIVE game we're discussing. How they made all these (other) choices work and how it waa implemented, programmed etc. How to make such huge maps with tons of NPCs work. How to even tackle such a huge project, really. It's also to teach and inspire other devs when your project did something big, new or really good.
As to the posts above re: why would they implement the infernal forge and steel watch and not let us learn/take anything from it, Larian sure as hell should be paying for my madness therapy too!