Rich Mogull outlines Apple’s security philosophy for BYOD and enterprise-owned devices as it exists in iOS 7:
Apple has a very clear vision of the role of iOS devices in the enterprise. There is BYOD, and there are enterprise-owned devices, with nearly completely different models for each. The owner of the device defines the security and management model.
Apple has always been criticized for not having an approach to the enterprise so this seems like a promising evolution in the security and provisioning of iOS devices.