I think the general appearance we see now is here to stay to be honest. Its very different to what we are used to but wouldn't say it looks unpolished. The icon's are no longer shiny and the textures have gone, but everything looks clean and vibrant IMO. I welcome the new look personally.At the bottom it says features see subject to change. Everything about iOS7 looks unpolished, very beta like.
And apple puts their signature on it?