from 2004, 2005, and 2006 thats 3 times the 2004 special editions have been released and one time only for the letterbox bonus oot.
Lucasfilm is still cautious about blu ray because they are worried about the copy protection being hacked. I think they much prefer at this point cinemax and HBO, and at some point pay per view on demand movies of the HD versions.
it is much more expensive to master and produce blu ray discs instead of dvd, and not everyone has hi def tv sets yet, it is still a niche market for early adopters of technology.
Yet Lucasfilm always saying it stays on the cutting edge on technology and entertainment makes me think Blu Ray is somewhere up there sleeves, and you know fox is breathing down his neck for them to be released, as well as sony the makers of the blu ray format. Because if star wars is released on blu ray as an exclusive title say bye bye to HD-DVD.