This is an interesting rumor. It HAS been around for a few years as the next location after WLV 2.0, along with Yacht Club as the other rumored location.
It is unlikely to be a "moderate" DVC though. It would be very very risky for Disney to build a "budget" DVC resort because it would downgrade the value of the points. Disney would have a hard time charging the ridiculous price point they are charging at a moderate location. Likely it would be an independent resort similar to SSR or OKW - I can't imagine sharing facilities with CBR. They still would have to have it be a lower point per night property just because of that location.
The other interesting bit about this is that previous rumors were they would build it on the OTHER side of CBR, which essentially abuts to the back of Epcot, and build a special back entrance from the resort into Epcot - allowing them to continue charging premium prices. This is definitely a new version of the CBR rumor.