I'm still not convinced on the security of fingerprint readers, and I think it's an incredibly bad idea to tie computer security to biometrics of any kind. It isn't like a password or e-mail address that can be changed if it gets out. You get one chance, and then your biometrics are compromised for the rest of your life.
I trust Apple with my data more than I trust most companies, because they have shown to act (relatively) responsibly with it, plus it's not their business model to sell that data. But even Apple would have to do a lot more for to ever consider giving up my biometric data for them to hold as a password replacement. The benefits just aren't worth the risks.
Like all data Apple collects, I'd be willing to bet the biometric data would be anonymous. Hence if it were to ever get out, no one would have the slightest clue who's it was unless they had access to some kind of police/federal database of fingerprints/bio data.
And we're talking fingerprints here.....again, what would Apple do with your fingerprints? These companies sell data to advertising agencies to make money.....I doubt any ad companies care what your fingerprints look like.
A little less paranoia