I'm hoping for this too, but I think you guys are talking about (forgive me) apples and oranges.
105437 is specifically referring to an Exchange security requirement that mobile devices have a 4-digit pin as a lock-screen requirement when connecting an Exchange account into the device.
We already know that other forms of authentication - Androids swipe gestures, iOS's complex lock codes - do NOT satisfy this requirement. They simple-mindedly insist on just a 4-digit pin for a lock code.
Vojta's suggestion that TouchID will be able to store the passwords and substitute them in where necessary is almost certainly correct. But it probably will not apply to the lock screen, because that isn't a "password" to the Exchange server. It's just an enforced security requirement.
Now... if iOS7 reports back to Exchange that 4-digit pin is in-use when really TouchID is in use... I can see someone's sensibilities being hurt and then entire device types suddenly stop working after a few days and patch-tuesday. It's one of those "stupid law, so change the law" things. I think Exchange has to budge on this, not device makers telling Exchange what it wants to hear.
Besides, you know what'll happen... we'll eventually get Exchange to allow TouchID. But every 45 days it'll tell us we need to get new fingerprints. :-P
Message was edited by: Dethpickle (I wasn't specific enough... duh)