The first part of the NBC Today interview of J.K. Rowling with Meredith Vieira and some fans is now online in video form at the MSNBC website, and a text report containing much of the same information is available here.
This part of the interview discusses what various characters are doing at the time of the epilogue, and has a bit to say about Snape. If you haven't read the book yet, this interview contains Deathly Hallows spoilers.
I will add my comments later. Thanks to roonwit for the report!