Evidence for significant change:
1. Macosrumors article
2. Member wishes
Evidence for minimal change:
1. History. For the past decade, Apple has made virtually no aesthetic changes to its software between beta and final. Apple has repeatedly ignored suggestions / criticisms of its interface during betas.
2. Apple devoted a section of their public web site to publicizing and promoting the aesthetic changes (
http://www.apple.com/ios/ios7/design/). As far as I know, Apple has never changed an interface after posting a software preview to its public web site.
What am I missing?