Warner said during the last HTF chat that a DVD re-release would be coming in the future, but didn't specify when that would be (I might expect that question to be addressed again in the near future). Personally, I would hold off buying the current DVD of this seminal film.
It's almost a given that Warner has already been working on the SE of this. Don't waste your time with the current snapper release. Unless you find on the sidewalk or for less than $5 maybe.
Amazingly, it looks like we're still waiting for this film to be re-released as a special edition (to say nothing of HD).
I just got the 1997 snapper version of this classic for my birthday (I had held off on purchasing for years in anticipation of a great Warner 2-disc set) and I'm wondering if it's best to just open it up and enjoy a great film or return it with the hope that WB will do something this year for the movie's 40th anniversary.
Warner is 99% guaranteed to release the film this year as a SE on DVD, HD-DVD and BD. They've done everything to state this except issue a press release.