Unfortunately, I don't think we'll ever see definitive releases of these films on DVD. The way I see it, LFL just doesn't have the manpower or the resources to give these movies the time and love they deserve. LFL is an independent company, so unlike major studios that release hundreds of titles on DVD each year and have the whole thing down pat, I get the feeling that LFL is always scrambling to get a release out. They might have one or two guys sitting standing by at a computer to do whatever change Lucas thinks up on a whim, but to really get the process down, they just don't have the time nor do they really care enough to get it right.
As another example, look at American Zoetrope, Francis Ford Coppola's company. Like LFL, they independently produce their own DVDs. Their efforts are decent, but, like LFL, they have problems ranging from quality control (shitting color timing on Dracula/the SW films), leaving obvious extras off the DVDs, and bad creative decisions (cropping Apocalypse Now/Lucas's revisionism). It's also the reason why The Godfather series still doesn't have that comprehensive DVD set it deserves. Sure Paramount recently ponied up for a new restoration, but in terms of extras, the new releases will barely be an improvement over the last release. Moving over to Star Wars, the possibilities are probably endless. They have vaults full of great material that could be used for extras. But assembling new extras require time and money and a great deal of effort. If I recall correctly, the extras for the 2004 set weren't even announced til the summer since they were still scrambling to put everything together.
That brings me back to the quality control issues. It seemed as though Lucas just greenlit the 2004 releases at the last possible minute in order to make the release window. And so everything, including the digital restoration, color timing, sound mix, etc. were all rushed into production. It didn't help that Lucas likes to change things as they go along, adding new CGI shots, etc. When color timing the film, they probably didn't use a source print as reference and instead asked Lucas what he wanted in each shot. After working on the prequels, he probably saw the opportunity to make the OT look more modern and hence the crazy color timing.