Yes! I definitely need an iPad version of Publisher! I'm desperate to know when a version is comming!
I'm currently using both Affinity and Adobe apps (especially because of inDesign, which is still the standard over here), but if Affinity would offer a version of Publisher on iPad pro. I would probably switch over completely. Right now, the only thing coming close to desktop publishing on iPad is Adobe Comp. But that is a very simple app and doesn't have all the typographic features I need.
So please great people at Affinity, give us Publisher for iPad pro! It's what professional graphic designers need and it will probably get you a lot of new customers.