Actually, Lucas stated in an online chat session that the DVD releases for both the new trilogy and the original will be the final versions.
Though they may come packaged together in a 6-disc set, the content of the discs *should* be the same.
He said that substantial work was put into these releases, finishing off uncompleted scenes, going through endless hours of behinds the scenes footage, special effects tests, etc. He said he practically felt like it was another round of post-porduction! So apparently they will be the definitive versions. I suppose only time will tell.
I have DVD-R's of the LaserDisc version, simply because they are the originals...and not the Special Editions.
