Historically, new iPod versions have always been released in the fall of each year. For example
- The 1st Generation iPod Touch released Sept. 5, 2007.
- The 2nd Generation iPod Touch released Sept. 9, 2008.
- The 3rd Generation iPod Touch released Sept. 9, 2009.
- The 4th Generation iPod Touch released Sept. 1, 2010.
- The 5th Generation iPod Touch released Sept. 12, 2012.
As you can see, the updated iPods were released each year until the iPod Touch 4G. Then, there were two years between 4th and 5th generation versions. Because of this, it is safe to assume that the iPod 6 Generation will be released in September of 2014, although this is not yet confirmed.