I have to disagree. Inside-app navigation in iOS is, truth be told, bodgy and confusing. Throw on top of that the need to handle notifications and app intercommunication and multitasking better and some systematic rethinking was really needed. I agree that graphically the new "commercial-art retro-chic meets skinny Helvetica" look feels like hard going - "it's sorbet and Love Hearts for dinner, everyone!" - but hopefully they'll have tidied and calmed things a bit by launch.