Lucasfilm and 20th Century Fox Home Entertainment need to do right by the fans! The excuse of not wanting the original versions out there doesn't work anymore because, guess what, they were officially put out there (just in 1993 quality).
If they seriously plan on streeting the blu-ray as early as next year, I really don't see how "Star Wars in hi-def!" alone will make it a bestseller. DVD was a much different situation. It was people finally upgrading from vhs and laserdisc (formats from the mid-70's) to "everyone's favorite format."
The smart move would be to release the films individually (like in '06) but include the original version on a second disc in the same quality as the 20xx version. Just slap a sticker on the front reading "For the first time ever, the remastered original version in hi-def!" There's no way that won't guarantee way more copies getting sold.
The prequels' discs could easily include the theatrical versions with seamless branching, no need for a second disc. Phantom Menace is the obvious example, since they are likely to replace the weird-looking puppet Yoda with the much more Empire/Jedi-looking digital model from Clones and Sith. I would still want them to include the '99 version of the movie, if only for preservationist/historical reasons.
Speaking of which - and I don't wanna get too ahead of myself here - what are your thoughts on including the '97 SE and making ANH, Empire and Jedi three discs each? They'd still have plenty of room across the three discs for whatever extras they wanted to include (Blade Runner only would've needed the three blu-ray discs if they hadn't also put it out on hddvd day-and-date, and we don't have that problem anymore now that the format race is over). I certainly think it would be interesting from a historical perspective, to let people see where all the controversy started. If the '97 interpositives are still lying around, all LFL would need is to make a fresh hi-def master.
Seriously, I find it just a tad ridiculous how Blade Runner, the movie that got swept under in the summer of E.T., can get the ultimate home video treatment, but Star Wars can't because the rights are owned by LFL and not a major Hollywood studio. It's been said before, but George Lucas' career has been rife with irony.