Here is the Dollar General Black Friday ad for 2012! I am going to list a few highlights for you below and then you can see the ad for all of the deals.
They open on Thanksgiving Day at 7am and close at 6pm. I indicated the Thursday only deals at the top. The rest of the list is available Thurday-Saturday (while supplies last).
Head over here to see the complete Dollar General Black Friday ad for 2012.