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It's hardly a must-have upgrade, but it would be cool to swipe your finger--instead of enter a password--to unlock your phone. It could also be combined with NFC (near field communication technology--see next slide) for making mobile payments.
Image note: Allegedly, Apple has filed some patents related to this feature.
Chances of implementation: 30 percentPhoto by: Apple
Since the feature isn't in the iPhone 4S, the odds increase that it'll make it into the iPhone 5.
Chances of implementation: 40 percentPhoto by: Visa
Chances of implementation: 10 percentPhoto by: iLounge.com