Today he has added his written outline for the graphic novel scenario. I just made a print of it. From glancing at it, it seems to be a mixture of the original series (dateline 1969/1796) and the little synopsis Warners released for the Burton/Depp feature--e.g. this novel has Barnabas returning to a semi-ruined, dilapidated Collinwood with "strange decor."
He said it's not likely to be up on his deviantart page for long, so if you're curious to read it, don't hesitate. The text is a PDF file you download from Googledocs so you need a Google/whatever log-in.
G.