Re: "Snatch and Run" - if the anti-theft properties of IOS 7 hold up, then it may the opposite - a "Gold iPhone" may be seen to have significantly less resale value.
There is. If you lose your phone, you can remotely disable it. Your AppleID and password are needed to re-enable the device, or to factory restore it. In other words, short of some software vulnerability, it is not possible to use a stolen iPhone with iOS7 except as a paper-weight. And, although there surely will be some software vulnerabilities, it will definitely increase the bar for profiting from a stolen iPhone.
Additionally, when you connect an iOS7 device to a new computer, you need to unlock it and confirm you trust that computer before it'll talk/sync to it (before that, it just treats the computer as a charger.) Which will stop unqualified attackers (who aren't aware of DFU mode) from just swiping your phone and putting their own stuff on it, or attempting to naively restore it.
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Re: "Snatch and Run" - if the anti-theft properties of IOS 7 hold up, then it may the opposite - a "Gold iPhone" may be seen to have significantly less resale value.
Time will tell.
Is there some superior anti-theft mechanism to IOS7 beyond the 'Lock iPhone' and 'Find my iPhone' features that wasn't there before?
There is. If you lose your phone, you can remotely disable it. Your AppleID and password are needed to re-enable the device, or to factory restore it. In other words, short of some software vulnerability, it is not possible to use a stolen iPhone with iOS7 except as a paper-weight. And, although there surely will be some software vulnerabilities, it will definitely increase the bar for profiting from a stolen iPhone.
Additionally, when you connect an iOS7 device to a new computer, you need to unlock it and confirm you trust that computer before it'll talk/sync to it (before that, it just treats the computer as a charger.) Which will stop unqualified attackers (who aren't aware of DFU mode) from just swiping your phone and putting their own stuff on it, or attempting to naively restore it.