I do not recall ever seeing early bird dinner specials at any of the Epcot WS restaurants. The lunch menu hours vary slightly at the different restaurants...some as early as 3:00 or as late as 4:00. And you can almost always get a better price for full course luncheon over the dinner menu. At one time, I made a 4 o'clock lunch PS and saved about $10 pp on our menu choice, over the same meal on the dinner menu. Of course, that timing, and the savings were the exception, but it can be done.