Just received an email to make my own meal for Qdoba. Ends up being it asks you what you want and print that above a coupon for 50% off you entree.
The expiration date was generated for 2 days out, so not sure how long this will last.
Linky
Edit:
According to various posts, the coupon may vary on what the discount is (BOGO, 50% off, free entree with drink purchase)
Someone from Qdoba posted saying you can get a coupon everyday for the next 6 weeks. At that rate, I will be half Mexican at that point