DVD. IT'S NEVER GOING TO HAPPEN

Oh, I believe that Richard Linklater is really trying to make this happen! I think that if he had his way, we'd have a Criterion-style 2-disc of this right now, and probably a special edition of Before Sunrise too!
The problem, I think, is that Warner Bros just seems to hate their independent films. There are a TON of indie films from the 80's and 90's that WB has handled TERRIBLY when it comes to DVD!
For starters, SubUrbia and Wim Wenders' Until the End of the World, and other films that I'm just not as familiar with, I'm sure, have never gotten U.S. DVD releases (Until the End of the World was also hacked down from its intended 5 1/2-hour miniseries form to less than half the running time- 2 1/2 hours- for the American release). Other films, like David Byrne's True Stories and Roman Polanski's Frantic (again, just two that come to mind because I like them), got terrible-looking DVDs that literally seem to be direct DVD copies of full-screen VHS tapes, with little or no remastering. We might complain about how we'd love a special edition of Before Sunrise, but considering how badly WB treated indie films in the early days of DVD, we sort of have to feel lucky that we even got a widescreen disc that doesn't look like it was copied from a VHS!
I thought that WB had started treating indie films a little better when they founded Warner Independent, released some great movies like A Scanner Darkly, and apparently decided to finally release SubUrbia, but now they've announced that they're shutting down Warner Independent and Picturehouse, and I greatly fear that hopes of a DVD of SubUrbia will die as well, since they are clearly continuing this long trend of mistreating independent films.
Let's just hope that Richard Linklater somehow convinces them to release it... it is, at least, a much more mainstream and accessible film than Until the End of the World, so I guess there's at least some hope that they could decide that it's marketable after all!