This is what Bill tells me about The Collected Stories of Ray Bradbury: A Critical Edition, which is expected to be published by Kent State University Press in five volumes, starting in 2010:
"This edition will reprint (actually establish the text for) every story that Bradbury has published, in chronological order. Ray has signed on the contract and we are just now finalizing plans with the press. I will be the general editor of the volumes with Jon as textual editor. Needless to say, I am very excited; indeed it will be the culmination of my critical writing on Bradbury."
CRT's previous production, Something Wicked This Way Comes, has won a Silver Ogle Award (these awards for Fantasy Audio Production are presented by The American Society For Science Fiction Audio). The award shelf must be getting pretty full; they already have an Ogle for Dandelion Wine.