This from TLC...

We now have some more details about the online chat with author JK Rowling on March 4th. The World Book Day Online Festival will be launched by JK Rowling with an interactive web-chat between 10 and 11am (in the UK).This will include 12 special questions from winners of a national schools' competition.

JK Rowling says:

"For me, being online is one of the best ways to get to Harry Potter fans; it's immediate, spontaneous and fun. So I'm thrilled to be taking part in the World Book Day Online Festival where I can talk to readers from around the world."