Don't know which version they showed. That info wasn't advertised, but it was a charity event with Lucas himself there on Saturday, May 8th for a Q&A. There was a similar event in Los Angeles with Harrison Ford that weekend. My feeling is that it was the SE or 2004 edition. Believing that made me feel a slight bit better about not being there, but only slightly. The only time I saw ESB in the theatre was the '97 SE since I was born in 1980. My parents did take me to see ROTJ in theatre when I was three, and I cried and had to be taken out of the movie because it was so loud. The unmasked Darth Vader scared me for years.
-NJM