For more information there’s also an interview on the Norwegian comic page Serienett. But it's written in New Norwegian, a variant of Norwegian so google translate have some trouble translating part of it.
Looking at the first promo art, it’s clearly inspired by Don Rosa.
|Promo art for #DuckRock|
We can see the same polar light and skyline used in several of Rosa’s covers and the opening panel of "Hearts of the Yukon". We can also see Castle McDuck, as we know from Barks' "The Old Castle's Secret" but also from Don Rosa stories like "A Letter from Home".
|Opening panels for Don Rosa's "A Letter from Home" and "Hearts of the Yukon"|
The same background scenery was also used on Tuomas Holopainen’s album "Music Inspired by the Life and Times of Scrooge". I’m not sure if that is just a coincident or if StarratS of UfotofU also is inspired by Holopainen’s album.
|Cover for Tuomas Holopainen’s album "Music Inspired by the Life and Times of Scrooge"|
Then we have the release party poster that is a reference to the first issue of the Norwegian weekly Donald Duck comic.
|#DuckRock release poster and the cover of Donald Duck & Co 1/1948|
For more "eye candy" (as they call it) check out the page I linked to earlier :)