If we are talking predict rather than hope then a second docking port or switching to standard USB sockets will never happen.
A second docking port would make things very complicated unless one was just for charging, and Apple don't do complicated, they do simple.
Ditto replaceable battery. Have you seen from the teardowns how packed in the iPad batteries are? You have to reduce battery size, and more importantly, make it complicated, see above.
I think you'll see a webcam.
It may be too soon after Job's recent bashing to see a 7" iPad, although I hope there will be one eventually.
It is probably too soon for them to get Retina display levels of PPI on a iPad sized screen yet, but I think within a year or maybe two there will be a version with 2x or 3x the resolution. (So that apps can be easily scaled)
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