As expected and widely reported ahead of today's keynote, Apple introduced a completely revamped iOS at WWDC. Not only did they ditch the skeuomorphic design scheme in favor of something a little more colorful and fun, the company added a handful of neat new features—some old, some new. But as with any major update to the mobile OS, there are a handful of features that won't be coming to older generation iOS devices. (Hint: It's because Apple wants you to upgrade.)
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