I've been holding off updating for a while since I have several character designs 'in play' on Hardcore right now. However, from some of the comments here it sounds like there is pretty good backwards compatibility. Will 'old version' character save files work in the 'new version'?
Postscript: Oh, this IS the 'old version' (i.e. DDO Planner 1) rather than the new design (i.e. DDO Planner 2) that is still in development. So, to answer my own question, yes character files generally transfer between updates just fine. Nice to know there are still updates being made to this while the new design is built out.