Some interesting answers:
Laura Trego: Was the absence of Snape's portrait in the headmaster's office in the last scene innocent or deliberate?
J.K. Rowling: It was deliberate. Snape had effectively abandoned his post before dying, so he had not merited inclusion in these august circles. However, I like to think that Harry would be instrumental in ensuring that Snape's portrait would appear there in due course.
[Snip]
Lecanard: Will we see Harry and his friends having their own history on chocolate frogs cards?
J.K. Rowling: Definitely, and Ron will describe this as his finest hour.
[Snip]
Katie B: Why was Kings Cross the place Harry went to when he died?
J.K. Rowling: For many reasons. The name works rather well, and it has been established in the books as the gateway between two worlds, and Harry would associate it with moving on between two worlds (don't forget that it is Harry's image we see, not necessarily what is really there.
*I think she's being coy and "King's Cross" is a religious reference.
