As the title says - What is the Definitive Edition all about? What makes it different to the standard edition?

Normally I would expect to see something extra ... DLCs, Soundtrack, Artbook, etc.

Well, definitive doesn't mean "improved" or "extended". It means, well, final and conclusive, the officially endorsed official thing, or, in the sense of stories, "canonical".

So I suppose you could say, this edition of Weird West is *certainly* the game Weird West. :)

It could also be a way of saying "we have no plans to release additional content, if we do a Director's Cut version we're not really sure what we'd change, and there's no cut content to restore or unfinished business..."

Of course, a cynic might also suggest that it could, possibly be a word that sounded good to the marketing department, devoid of meaning.