The purpose of a "model" room is to exactly mirror an actual room. DVC has largely followed the same floor plan through 4 resorts now, but they still construct model rooms to show their prospective customers exactly what they will be buying. Up until the spring of '04, the sales center was located at the Boardwalk. The Boardwalk had exact "models" of all DVC resorts, including Saratoga Springs before the sales center was relocated.
This report (if true, and it does seem logical) has no bearing on the actual design of future resorts. If anything, it indicates that DVC is resigned to stick with the current room floor plan, which isn't too big of a stretch since they've been using the current plan for over a decade.
In the end, all this means is that before DVC begins to sell a new resort they will gut 2 or 3 rooms at Saraotga Springs and furnish them to match the new resort rooms.
The exact comment was: "They did say that the SSR would remain as the model, and that the decor would change as to what the new DVC rooms would look like. "
The way I read that, it states that the DVC sales center and model rooms will remain at SSR even after all points have been sold at SSR. Model units (at SSR) will be refurbished to reflect the decor of new resort offerings.