Oh yeah, I think I saw that interview posted at Ohnotheydidnt or something... it's nice that JK told us more about the characters.
I don't know whether it was in the live chat or somewhere else, but my friend told me that George named his son Fred. That just about killed me :D I was wondering why, say, Ron hadn't named his son Fred or something, but it's all the more aww-worthy when it's George's instead.