Well it will make sense for Apple to do something big with iOS 7. They need to realize that Android is right now catching up to them, and with Android 5.0 coming this year it could deliver the fatal blow to iOS. If Apple doesnt do anything, Android will win and a lot of people will end up leaving their iPhones for something newer and, dare I say, better.
Android catching up to iOS is a load of bull, at worst they're on an even split. As past keynotes have suggested, Apple have great figures for their OS - not to mention being able to realise that although Android tablets outship the iPad, no one uses their Android tablet.
As with the Mac, Apple know that as a company who creates premium products not everyone will be able to afford something of theirs (even if the prices are great when you consider how good the products actually are in comparison).
Apple will not (in my opinion) create features in iOS 7 just to be neck and neck with Android, instead, they will add features which are right for the user and meet requirements of security, design and usability.
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Widgets and themes are a cheap way to 'attract' android users, and a dangerous way to repel current iOS users.
Apple (quite rightly) love ubiquitous design. It not only makes their products immediately recognisable, but as easy to use no matter who's device you are using.
Take iOS for example, when it was shipped with iPhone it was great and everyone loved it. Because of its simplicity and great design, it was easy to push over to iPad, and as Steve said "people immediately know how to use the iPad" because of the millions of people who had bought and used iPhones and iPod Touches.
Even before the iPod, Apple's key features in its products is for people to be able to use it - no matter they're situation.
This is why widgets are a big no, with an iPhone or an iPad, they have great apps, but are the merging of widgets and Mac apps.
Due to hardware and screen size constraints (not to mention the ratio between 'finger size' and cursor size) iOS does not need widgets, just use the apps it ships with or the over hundreds of thousand on the App Store.