From what I have gathered, if you are on iOS6 (like me) and want to update, you can do so without loosing any data at all. This makes it so you do not need iTunes 11.1 beta bc you don't need to sync anything bc it is all already there (pictures/music/texts). So, if this is the case than why are people doing a clean install? Does it make the phone faster or anything? Even if it does, why not just Update now, and wait for iTunes 11.1 to be released, make a local backup of the updated iOS7 at that point, then do a clean install + restore once it is out. That way you can still use iOS7 until the new iTunes is released.