There will probably be a few revs before 4G (which based on 3G/HSDPA usage would mean wireless 4G/LTE usage), as it will take years to get reasonable deployment for those.
There will probably be a spike to 32GB when Apple switches to the 16GB flash chips.
Video is software, not hardware, and there are technical reasons (no focus) that we may see 2mp stay for the camera for a while. Better battery, 802.11n WiFi, higher screen res (640x480), and other internal tweaks are probably more likely short-term than 4G.
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