I was excited to hear the other day that leveling cooking will be a little easier, as more recipes are likely to go grey a little later, but Bornakk has more good news for cooks after patch 3.1. He confirms that new recipes are going in as well, and he can think of two off of the top of his head (so hopefully we'll see even more than that).
That will, as he says, make the Chef de Cuisine achievement that much easier as well -- it'll probably still be a pain, but at least there'll be a few more options to pick up new recipes. And I'm curious to see what the new food does, too: I like cooking the usual stat food as much as the next culinary expert, but I'm almost more interested in the fun stuff like Last Week's Mammoth (what a bummer) and the good old Delicious Chocolate Cake. Those cosmetic items make cooking much more fun than just the usual stat buffs that most food give.
So we'll keep an eye out for new recipes. Completists will have at least two more to grab with the new patch.