Religious historian "Diana Butler Bass will be online Wednesday, Dec. 6 at 3 p.m. to discuss the reasons behind the split and the possible outcomes for the church. Submit your questions and comments before or during the discussion".
Here's more about DBB.
Newsbusters also has this on Diana Butler Bass. I think their point is fair enough. The WaPo article cited by Newsbusters (and, indeed, the promo for the live discussion) should say she is not someone who puts herself in the conservative camp. I suspect that will come out in the live discussion.