Beckles--Sorry, but I don't know if Delta is running any sort of promotion with the switch in their dining programs. I haven't even seen them announce the change yet; I just happened to find out about it when I called the old program administrator to get a copy of their 1999 restaurant listing. I asked the agent at Dining a la Card about any sort of promotion when I signed up for the new program, but he wasn't aware of one.
My guess is there won't be a promotion, however, since American didn't have one when they made the same switch in dining program administrators at the beginning of 1998.