iFixit published photo of the disassembling procedure of the new iPod nano and iPod Classic
AS illustrated by the photo, the motherboard is getting really smaller, while most of the space in the enclosure is taken by the battery.
For the iPod Classic, one can see the new CE-ATA port on the 1.8" Toshiba HD. The battery is also taking almost place.
[translation by Linathael]