If you haven’t already started to support it in your own environment, there is a great deal of activity centered around applications on mobile devices in the enterprise. There are various tools and solutions to assist. Ranging from application development, Mobile Application Management (MAM), and Mobile Device Management (MDM) solutions.
Here is a quick link to an article that sums it up pretty well:
I think the main unknown at this time is how the new Microsoft Windows 8 platform will provide the ability to support an Enterprise App Store for private in-house coded applications, not provided on the public Windows App Store.