Bank of America's website and press release says that you can use your TouchID on iOS to sign into BofA's mobile  application on iOS.

This move is a major milestone in FIDO's and fingerprint biometrics' adoption in the mainstream consumer authentication market. Forrester expects fingerprint authentication will greatly improve the customer experience – no more fumbling with hard-to-type passwords on small smartphone keyboards. It's important to note that matching the fingerprint to authenticate the user happens in the mobile application on the mobile device. As such it is not a true two factor, strong authentication where the match happens on the server side.