This would be the seventh version of I-Pod nano.As news there will be more functionality and features in the new version with touch screen option and 1.3 MP camera as well. If you are thinking about the size well then the size will be as same as the I-Pod Nano Shuffle released in 2009.
In the fifth generation, i-Pod also has the touch screen and camera feature but the device was relatively bigger in size.So, now you will not need to worry about the size anymore.
New i-Pod nano shuffle leaked Photos
In the six generation they have finally removed the touch screen and camera feature in order ro minimize the size. Well now you don't need to worry about you don't have touch or camera functionality on your i-Pod.
In the new I-Pod nano Shuffle version - there will be Wifi, 1.3 MP camera, Touch Screen and more but the release date isn't confirm yet.