Love your product line thus far so please don't take any offense, this may come off a little negative but I really care to speak up regarding this app as a professional in the Graphics Design & Digital/Offset Print industry.
It's chosen name "Affinity Publisher (A.P.)" brings back a lot of unfortunate memories of "Microsoft Publisher (M.P.)". The name in its self may turn away many future potential customers & veterans in the print industry because we've had to deal with so many headache files supplied by the latter over the years. Since M.P. predates A.P. some may be led to believe that's the level of quality to expect from your app & pass on it without giving it a try. I truly hope this makes sense. Please consider an adjustment to the name "Publisher" as it stands to represent a subpar desktop publishing experience (in the professional Digital & Offset print industries). Based on what's offered with Designer & Photo, I believe your page layout app should have a name that maintains your companies level of expertise. I totally understand that "Publisher" by definition describes A.P.'s capabilities, however if you really want it to have a fare shot when production pros see it released to the market for the first time, I humbly ask for your reconsideration & passionate thought on its name.