Yes, it would. I'm sure GL looks at what fans say occassionally, so there's a chance of it being in Ep. III.
I found this Classic Moment on the Official Site. It was called "Cliffhanger," and was posted on the site on Jan. 4, 2002.
"I remember very early on asking who my parents were and being told that my father and Obi-Wan met Vader on the edge of a volcano and they had a duel... Now, I wonder if it's true? I mean, there are so many things. For example, remember the Clone Wars? They could have cloned my father. It's all speculation at this point, sort of like who shot J.R. Ewing."
It said that Mark Hamill had said this and what George had told him.
I'm not saying the lava duel will be in it, I just think this little piece of information is neat.