[newman314]

Two words: Privacy implications.

I, for one, would love to know if this information is stored just on the device (securely?), transmitted and under what circumstances.

[WalterSear]

Of course it's secure. We had the top government men in the other day to make sure it was!

[potatolicious]

The fingerprint is kept locally only. Presumably when it uses it to authenticate a purchase it's actually validating locally and sending up your password (or other auth token) rather than sending the biometrics directly.

[amenod]

Yes, exactly - the said men from the government assured us this was so. :)