It's been a while since I've asked but the last I heard they were still issuing the Celebrate Today Disney Dollars. They don't seem to be issuing new ones yearly like they used to. But with DCA's grand re-opening and the new Fantasyland expansion in WDW perhaps they'll come out with something new for 2013. Those are the only special occasions I can think of for issuing new ones right now.
"Anything's possible at Disneyland." - Walt Disney, 1965