Postponed. Here's the statement from the organizers:
It is with regret that we have to postpone the Atlanta and Dallas dates for Death To All 2012, but there is a good side. Many things have led us to this point including very low ticket sales, issues with opening bands being available and several other factors. We are very sorry to all of the Death fans this has caused an inconvenience and wish things could have been different. We did everything in our power to avoid this situation, but in the end the choice had to be made. The good news is that we are working to re-schedule these dates for early next year, and if possible, add more dates surrounding them in new cities! Please hold on to your tickets, as they will be honored.
http://www.metalinjection.net/latest-news/bummer-alert/death-to-all-atlanta-dallas-shows-postponed