I don't want to comment on all of DH yet because I'm still getting my thoughts in order... but I have some things to say with regards to this interview, in which JKR "clearly lays out the characters fates." Or, well, my comments aren't actually about the interview at all but rather about what I imagined the characters had been getting up to in the fade-to-black nineteen years.

After I finished the book my prime concern was WHAT HAPPENED TO WEASLEY'S WIZARD WHEEZES????? It was a Serious and Urgent matter. Eventually I concluded that Ginny had partnered with George to continue creating whiz-bangs and firewheels and whatever other magical shiznit they come up with, and then they hired Hermione to head up the business aspect of things and they TOTALLY DOMINATED economically and all became quite wealthy. And Harry sometimes worked in the flagship store as a clerk (!!!!but it really drew in the customers!) and sometimes gave lectures at the Auror Academy or Hogwarts or Beauxbatons or even, on one memorable occasion that involved far too many clothing items made of fur, Durmstrang, and sometimes worked as a special advisor to the Aurors and Magical Law Enforcement. When he had kids he cut back on all his work duties so he could coach Little League Quidditch teams and whatnot. Ron was an Auror and became renowned in his own right for his daring escapades and creative use of WWW products in tight situations (Hermione did not approve but did admit that it made for good advertising). Luna, of course, traveled the world and worked for the Department of Ministries and sometimes even did both at once, and always stopped by the homes of the Weasleys and Potters to offer up convoluted bits of wisdom to the next generation.

And Neville was Hogwarts' professor of Herbology and Percy was professor of Arithmancy (as well as Deputy Headmaster, because someone had to be). Trewlawney, newly emboldened after participating in the battle of Hogwarts, came down to the regular castle area more often and even went to Hogsmeade once or twice, though she vowed never to go again after she was quite badly frightened by all the nasty ghosts at the Shrieking Shack (read: she slipped in a puddle and realized that going outdoors came with unexpected dangers). McG continued to head Gryffindor house and put quite the fear of god into young little James Potter, whose tricks she already knew quite well, having endured two generations of them already.

And Severus Snape wasn't really dead, he had just gone into a meditative healing state until someone was able to fix him up. After that he moved back to Spinner's End and lived the rest of his days in a mopey funk (his natural state of being, you see) which was occasionally punctuated by the odd bout of activity brought about when his mail-order made-to-order potions business (advertised under the pseudonym "Brian Evans") actually had a customer.