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Flippin 'eck, some of us haven't even got to touch a 1st gen yet and already you're discussing the 2nd gen!
Way early to be dreaming about what you want in a version 2
I do think that two things are more likely than anything else mentioned here
1 new faster chipset/cpu cortex A9?
2 512M memory
Some people are focusing way too much on the camera thing. Get your iPad and go outside. get some fresh air.