We are going the first full week of June so the discounts for our dates were released at the end of December as part of the "spring discounts". The Disney VISA offered a different and deeper discount than the general public discount. It was about 5 different resorts (SSR, OKW, VWL, BWV and Poly...so only DVC resorts) and it was 35% off (general public was 30% off villas, and other discounts and categories were available). There wasn't much availability though. Our TA had to call in bc the VISA promotion could not be booked online so she was on hold several hours (as general public discounts were released the same day). By the time she got through, there was only VWL for the dates and room type we wanted.
It was an interesting discount in that usually the Disney Visa discount is the same as general public, just released a few days before.
For the summer discounts that just came out, I did not see a Disney Visa discount.