According to 9to5mac the new iPod flagship model (iPod Touch) will have same form factor as iPhone but with few exceptions: Outside rim will be black and the top surface will be more like 5.5G iPod and not like iPhone (rounded), no ear speaker or microphone (its an iPod not iPhone) and bit thicker then iPhone.
It will have few things in common with the iphone like it will run on OSX, 480 X 320 screen resolution, Coverflow and home button like iPhone. According to 9to5mac they have spy-shots of the upcoming iPod video/touch but they have been sent the notice too. (Apple’s legal team’s warning).