According to the photos leaked by CrunchGear of an iPod Touch 5G which shows the capacitive home touch button and 128GB space of memory. The back of the device is made up of aluminum, something we are expected to see in iPhone 5. Either in replace of non-physical home button, a capacitive one would reduce possible wear and tear on the device over time..
Looking at the photos EXIF data, one can see that they were taken with a Samsung Digimax A402, which was released back in 2005.

Marked with the “DVT-1″ badge found on the earlier examples of the iPod Touch discovered in 2010 that sported front and back cameras, this model has 128GB of memory, is running firmware 4.2.1MC14 and is marked model MC550LL which points to a Mac Pro model as well as a permutation of the 4th Gen iPod Touch.
Looking at the photos EXIF data, one can see that they were taken with a Samsung Digimax A402, which was released back in 2005.
