If that happens then the Superfinal will be flown on wings certified to date (the EnZo wasn't finished AFAIK), and so will the 2012 season most likely.
From the phrasing of the letter is is not clear if the certification stop includes "classic" EN D wings as well - that would be a bummer, but on the other hand the discussion within the WG has shown that the definition of "classic" vs. "competiton" EN D is not easy...