An apparent glitch in the iCloud account system has resulted in some accounts showing extended storage space with renewal dates years in the future.
iCloud's use of online storage as a syncing medium lowers the overall requirement for online storage, so Apple has reduced the base level to 5GB. However, Apple offered existing MobileMe customers a temporary extra 20GB of storage to accommodate user data during the transition to the new service. Apple originally offered this extra storage for a month, but increased this timeframe to September 30 and has been notifying users of this upcoming change.
On September 30, Apple did make a change to users' iCloud accounts; however, to users' surprise, instead of a lowered storage level, their iCloud accounts kept the same 25GB of space and furthermore showed the expiration for the storage had been pushed back to 2050. In checking my iCloud account, sure enough the renewal date had changed from being an annual occurrence to 38 years in the future.
Unfortunately this change is just a glitch in the system, likely from an operator error, and will soon be corrected by Apple. Therefore, if you see your iCloud account show you this surprise benefit, do not be surprised if it disappears in the near future.