For those not aware, the DOD bases this decision on their Commercial Mobile Device Implementation Plan.
From the news items, they have approved:
- iPhone iOS 6
- Blackberry 10
- Samsung Galaxy devices with Samsung's Knox
No other Android devices (which is interesting, as Motorola Solutions came out with a highly secure Android phone recently). No Windows Phones. Will they approve more in the future? Not clear.
For those not aware, Knox is a security add-on to Android created by Samsung. You can read more about it HERE.
I need to look further into Knox.