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Yes. The cars were designed with that sort of future compatibility in mind. That is how they were able to implement and demonstrate the battery pack swapping station. While I personally don't believe there will ever be as many battery swap stations as there are super chargers, it is quite believable that in 5 to 10 years I'd be able to drive somewhere and swap out my aging battery pack for a new one that will have a higher capacity than what my original pack had when new.

As long as they maintain the same form factor and interface, yes.

Alternatively, you could find someone to build your own pack in 5-10 years.

The battery is removeable (http://www.youtube.com/watch?v=H5V0vL3nnHY) so I guess it's reasonable to assume upgrades will be available (if the company still exists/we're still buying cars).