I was at the same member's update at OKW (Jan 13).
The discount will depend entirely on which cruise, what category room and how far in advance you are making the reservation.
Since
DCL releases it's cruises about 18 months in advance (sometimes even more-sometimes a little less)- the greatest cash discounts are available to those who reserve the earliest. As the ship fills, the discount decreases until the rate eventually reaches the brochure pricing (maximum rate).
DVC negotiates both the point cost and the cash rates in advance. If you are booking a cruise for a popular date within a few months of sailing, the cash rate may for your DW may well be better than what is available thru the cruise line.
Right now, DCL has released 3 and 4 night cruises for all of 2005 and 7 night cruises thru May 7, 2005. The remaining dates for 2005 7 night cruises should be released soon.
To truly know the discount available (if any), you'll need to research the cash rate (you can do it thru Disney online or thru any
travel agent) and then contact MS to see what is available.
Enjoy!