All of the details from Apple’s Support Doc:

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.

iCloud Team

As a thank you to our former MobileMe members who moved to iCloud, we have extended the complimentary storage upgrade they received until September 30, 2013. This extension applies to accounts moved to iCloud between October 12th, 2011 and August 1st, 2012.

How do I know if the complimentary storage extension applies to me? If you are a former MobileMe member and had access to more than 5GB of MobileMe storage when you moved your account to iCloud, then you received a complimentary iCloud storage upgrade automatically. That upgrade has now been extended, free of charge.

How much complimentary storage did I receive? Your complimentary storage upgrade was based on the amount of MobileMe storage you were paying for when you moved to iCloud. You were granted either the 10GB, 20GB, or 50GB storage upgrade.

To check which storage upgrade you received:

  • On an iOS device: Go to Settings > iCloud > Account.
  • On a Mac: Go to System Preferences > iCloud, then click Manage followed by View Account.
  • On a PC: Open the iCloud Control Panel for Windows, then click Manage followed by View Account.

How long does the complimentary storage extension last? We will continue to provide you with this additional storage until September 30, 2013, or until you choose to upgrade your iCloud storage plan.

Can I buy more storage if I need it? Yes. If you need to upgrade your storage to a larger amount, you can purchase one of our standard storage upgrade plans at the regular price.  Please note that when you purchase a new storage upgrade, it will replace your complimentary storage plan. If you cancel the upgrade at a later date, you will return to the standard free 5GB storage plan and will no longer have access to your complimentary storage upgrade.

What if I already upgraded my storage plan prior to this extension? If you upgraded your storage plan before September 30, 2012, we have automatically extended your upgrade at no additional charge until September 30, 2013.

Can I transfer my complimentary storage upgrade to another account? Your complimentary storage upgrade is not transferable. You can use it only with the iCloud account that you originally moved from MobileMe.

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