Out of curiosity, what kind of a show you'd find impressive and special?
I don't even want them to deviate from the Maiden stage show traditions too much, but at the same time there's nothing indicating that the marketing talk about doing "things we've never done before" and the show being spectacular wouldn't be true. The reserved stage area will apparently be more or less the same in size as before and given how good shows like Legacy of the Beast and The Book of Souls looked, I don't think there's much reason to doubt that when combined with a handful new and refined elements the result will be even more stunning visual feast.
I think that elaborating & refining the classic elements of a theatrical Maiden stage and adding some new things or effects in it is definitely the right way to go.
Of course it all depends on what one considers "spectacular" and all, but I think the best Maiden shows have been spectacular and I'm sure the upcoming show will be spectacular too.