Apple is not divulging any details about what was specifically fixed. An audio distortion problem that came up when playing or ripping CDs is also taken care of.
Another software update that Apple is coming up with in the iTunes Store, iTunes Match, and iTunes in the Cloud in Brazil and Latin America. The store will feature Brazilian and international music across all major and independent labels, with a catalog of over 20 million songs at launch. In addition to music, over 1,000 movies are available to rent or purchase. This service is in collaboration with the App Store, and most songs and albums are 99 cents and $9.99, respectively, and one can beta-test iTunes Match for $24.99 / year.