iOS 6 with a unified file system would have been bold and daring. Making some ugly icons as the centerpiece of iOS 7 that hundreds of amateurs could make better in less than 24 hrs is not a sign of a company with a market cap of $450 billion. It's actually kind of pathetic given their talent pool and cash. Investors aren't impressed either.
And I'm sure Apple used a lot of money in R&D to see what the market trends were and it revealed it was time to freshen up the GUI of iOS. But lets wait and see what happens when the final of iOS:7 is released.
Wasn't there a lot of complaints when iOS:6 revealed Apple ditched Google Mas for an in-house solution? Yet at the WWDC, iOS:6 had the highest adoption rate? Hmm...