GM is doing it so I wouldn't be surprised to see Ford also doing it. Last year they did it in September and cars went fast. I just got a 2007 Mustang on X plan and with rebates. I thought about waiting to see if 0 percent would be offered but I had a difficult time finding what I wanted as it was.
The color I wanted and equipment I wanted is already in short supply. It took the dealer three days to find it and he had to go almost 1,000 miles. Even then it was a fluke because the owner of the dealership was driving the car and had just put it into inventory.
My point, if there's a car you want, buy it. If 0 percent is offered, don't hesitate because the cars will go, if there is even one you want.