But but iPhone is not he only device I access many sites from. What if I need to sign into the website from my PC and need to use firefox or IE for that?
The fingerprint sensor auth will just fill in the form fields with your username and password. You can sync these over to your desktop machine and use them like you usually would there.
Also, as the post alludes, if they can figure out how to integrate the fingerprint sensor into the touch screen itself then they could, in theory, do the same with your touchpad on the Mac. So authenticating on your desktop would be the same as the phone assuming you were using a Magic Mouse or Magic Trackpad.
That would be amazing, having a password+fingerprint option built into my laptop.
My thought exactly! I still occasionally want to login to sites on, for example, my Android tablet. Given that Apple doesn't provide other platforms access to my data in iCloud, I find it hard to see how they would allow software on other platforms access to my login credentials.