When it first came out they were working on a virtual table top and Character Visualizer. Over the course of the last few years both have been scrapped or delayed and re-imaged. Recently an announcement was made that the new Virtual Table Top (Less full-featured than the initial attempt) would be available to the DnDi Subscribers in batches.
As for builder/designer - I'm sure someone else can offer an answer
I've tried dungeon designer and a few other applications but i havent found one I like yet.