It's been reported that
DVC is working on adding the Dining plan option to DVC stays. Several members have received this information when they emailed MS about the issue. One member reported that her guide said the option would be available beginning in 2006. Obvioulsy, this is not announced, confirmed information, so it should be taken with a "grain of salt." Since there are several "enhancements" planned for the DVC website and the DVC reservation system for around this time, I tend to believe it, though.
That said, I would not use a dining plan - it would just encourage me to overeat to get my money's worth. DDE is a better option for people like me.
Best wishes -