I just got this email from Barnes & Noble. Apparently the Nook app isn't at 100%, but the problems are not that severe.
http://m2.m.bn.com/nl/jsp/m2.jsp?c=... Service-_-130917_NO_CSR_US_IOS7_UPDATE-_-web
I got that email yesterday. Excuse me, but they had 3 months to get their software ready, and they don't??? Serious fail. I rarely use the Nook app anyways but just the point.