Personally, most of the comments I heard on the WOtC DDI forums were of the "WotC hasn't told us if they are committed to working on further DDI tools or not". For me, this survey prety much answers the question with a defiinitive yes. I understand how the answers aren't as definitive as some people would have liked, but at the same time, I understand why WotC would not want to give out details of just what their next tool will be until it is further along the production path.