It's a pretty convenient and smart use of location services. But imagine you're on the way to the airport and your iPhone falls out of your pocket as you get out of the cab. Now, imagine that a stranger picks the phone up and because it's at the airport, your boarding pass gets displayed. Without even unlocking the device, that person knows your name, where you're going and potentially other important details like family members you're traveling with or the company you work for. That's enough information for someone to find out more about you where you live, what you do and so on. It might even be enough information to get your company's helpdesk to unlock your iPhone remotely and thus get access to your iPhone and the personal and business information on it -- a rather chilling possibility for both individuals and IT departments following the Matt Honan hacking incident.
There's an easy safeguard against that scenario that IT departments can put in place: iOS 6 mobile management includes an option to prevent Passbook from displaying data while an iPhone is locked.
Keep personal email off corporate servers
One feature Apple focused on with iOS 6 involves frequently emailed contacts. Like most email clients, including OS X's Mail and Microsoft's Outlook, Mail on an iPhone or iPad can build a list of recent/frequent email contacts. If you regularly correspond with someone, you'll notice that Mail will auto complete his or her address as you begin typing it, even if the person isn't listed in the Contacts app. Microsoft Exchange supports automatically syncing such recent contact data from devices and applications. That means these recent contacts can end up popping up in Outlook (or another application) on your work PC as well.
In iOS 6, Apple makes this recent contacts sync a mobile management option. That means that IT shops can automatically prevent recent contacts on an iPhone or iPad from syncing to the server. That keeps a stricter separation of personal and business use, ratchets up employee privacy a bit, and keeps the number of auto-completing contacts on a work PC more streamlined.
Setting the wallpaper
iOS 6 allows administrators to set both the lock screen and home screen wallpapers for iOS devices. This isn't a particularly critical option from a security perspective, but it can be used to identify devices as belonging to a specific company, grade level, or department. Typically, you'll want to use a corporate logo or similar identifying image. All the typical image formats (GIF, JPG, PNG) are supported and will be scaled and cropped automatically as dictated by the size/type of device.