My mind did go there, yeah, but one piece of promo art is hardly enough to jump to those conclusions lol.If you're thinking that it was possibly drawn by one of the assistants to show us how it could look like if Miura's assistants continued the story, some comments on Twitter are waaay ahead of you (Which is obviously too far-fetched.)
I just think, if they were going to do some new art, why not make it new art and not a copy of old art. The Berserk community in general is absolutely plagued by "hey, look at this drawing I did!" (insert flagrant trace/copy of Miura art here) so it's a bit baffling to see it happen in an official capacity.