Our blog post yesterday addresses this. We never make any major changes to the API without announcing it way in advance first to give developer proper time to prepare. When we're ready to make such announcements (related to the unbundling or otherwise) you will know about it!
In the meantime, the best things to do are make sure you follow @foursquareAPI and double check that the email address associated with your Foursquare app is up-to-date and monitored, since we also make announcements there.