This additional storage was meant to be around for just the first month of iCloud, but it was extended to the end of September. Users were pleasantly surprised to see a 38-year extension of their existing storage levels when September 30th rolled around instead of an expiration. Apple has fixed this issue by offering another temporary extension for 20GB of storage for another year, with the following e-mail in tow which you can read after the jump.
Dear [iCloud User],
When you moved your MobileMe account to iCloud, we provided you with a complimentary storage upgrade beyond the standard 5GB that comes with an iCloud account to help you with the transition. Originally, this storage upgrade was set to expire on September 30, 2012.
As a thank you to our former MobileMe members, we will continue to provide you with this complimentary storage upgrade at no charge, for an additional year, until September 30, 2013. No action is required on your part. For complete details, please read this article.
Thank you again for using iCloud,
iCloud Team