From the email:
Due to the very limited number of badges available and our vendor EPIC Registration being focused on coordinating onsite registration, the Comic-Con 2013 badge resale will be conducted utilizing a random drawing.Good luck, Launchies! And let us know if you'll be attending -- I really hope to meet some of you there! :)
To enter the Comic-Con 2013 Resale Drawing, login to your Member ID account now and click the blue notice that says “Click Here to Enter a Drawing to be Eligible for the Comic-Con 2013 Badge Resale!”
The drawing entry period will remain open for 48 hours only, and will close June 12, 2013 at 10:59:59 AM Pacific Daylight Time (PDT). Late entries will not be accepted.
You must have a valid and confirmed Comic-Con Member ID to enter the drawing.
Anyone who has already registered for or purchased a 4-Day badge (with or without Preview Night) or a single day Saturday badge will not be eligible to enter the drawing. [...]
Comic-Con will notify everyone who is selected to participate by email on or before June 17, 2013.