ipod touch 5 :

Apple is very likely to unveil its fifth-generation iPod touch at a special event in September, regardless of whether or not it resembles the prototype. A capacitive button if it reaches the final model could signal design changes coming across the entire iOS line. It may prove controversial since it could lead to accidental button presses that aren't as likely with the current click-in button.

The storage may be the most probable upgrade, since Apple hasn't gone past 64GB on the iPod touch since the capacity was added in late 2009.

* Read more: http://bussinessizucha.blogspot.com/2011/05/ipod-touch-5-whats-next.html