The change may be in response to privacy concerns or as a way to pre-empt them. Mobile ad networks, for instance, use the UDID to target ads. It is not clear whether Apple itself will stop relying on the UDID as a unique identifier for iAds, Game Center or other services.
This is a big deal, especially for any mobile ad networks, game networks or any app which relies on the UDID to identify users. Many apps and mobile ad networks, for instance, uses the UDID or a hashed version to keep track of who their users are and what actions they have taken. App publishers are now supposed to create their own unique identifiers to keep track of users going forward, which means they may have to throw all of their historical user data out the window and start from scratch.
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