Sorry but my crystal ball is broken. 😀
If there is one thing that the iPhone has taught us, its not to speculate. NO ONE had ANY clue what the iPhone was to look like or what features it had. MANY though they did only to be proven wrong: 2 batteries, keypad with touch screen, white in color, etc....
So we can guess all we want, but it will be futile beyond basics. 3G is likely if a chip set can be made to consume less power/heat.. and one has. 🙂