Here they are, the dates for three Rowling interviews! Thanks to The Leaky Cauldron for the update!
July 6: Jonathan Ross (BBC One) [press release]
July 20: Blue Peter (BBC) [press release & contest info]
July 26, 27, 29: Today Show (NBC)[press release]
So the Ross interview will be pre-movie and book, Blue Peter will be the day before the book comes out, and the three-part Today Show interview will wrap it all up.