I just finished my Wondrous Tails and I got 3 lines for it. Now the question that I have about this is if I should turn it in now or after the expansion launches?

I've heard that the gold certificate is not available as a reward if you pick up the Wondrous Tails while you are not level 80, which is the current level cap. My concern is that the gold certificate won't still be there next week if I decide to hold onto the Wondrous Tails.