Most importantly for me, already purchased and installed apps will continue to work. Per the FAQ pointed to earlier:
If I don't renew my iOS Developer Program, will my app still function for customers who have already installed or downloaded it from the App Store?
Yes. If you do not renew your iOS Developer Program your app will still function for customers who have already installed or downloaded it. However, without renewal of your Program you will lose App Store distribution and your app will no longer be available on the App Store.
