Original Link: http://support.apple.com/kb/HT5527?viewlocale=en_US&locale=en_US

Apple:

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.