- Lockable Keychain items that will only be accessible once a fingerprint is verified. Great for banking and enterprise scenarios. Needs Keychain API overhaul, completion block implementation.
- Keychain Credit Card items with aforementioned lockable attribute.
- "Pay with iTunes™" or IRLP (In-Real-Life Purchases). Horrible concept names, massive possibilities. A vertical Apple would venture into?
Being able to lock a Keychain item requiring a fingerprint could possibly be the first basic API access developers get to Touch ID. I suspect that will be the kind of level of access developers will get to Touch ID, indirectly through other OS managed service API's.