Some concepts are way off the charts when it comes to realism, and practicality while others are pretty much doable. Take a look at the specifications of this next generation iPhone 3G and let us know whether it can be achieved or not in the near future without being a burden on your already beleaguered bank accounts. We think the former is possible, although the latter doesn't look like changing anytime soon, next generation iPhone 3G or not.

Titanium and glass
OLED screen
3G connectivity
GPS support
Front camera for iChat
Removable battery (finally)
3.2 megapixel camera
Video playback