Funny how they managed to release nearly 50 movies in polarized 3-D in the 1950's and two dozen polarized 3-D movies in the 1980's (on 1000 screens at a time) yet they act like it is impossible now.....but in any case that's all about to change in the next few years.
It's not impossible now; it's just that from a chain point of view, the points yielded to the theater from a film release make the expense per showing rate such that they don't want to spend (it eats into the profit margin). Right now the 80/20, 70/30, etc. split based on opening weekend, etc. means theaters make less on shorter run films. In the 90s and before, you could count on films staying in a theater longer, thus helping to make up the delta regarding cost to show. With DVDs on the shelves, and movies having a much shorter stint at theaters, the justification to spend to show a single film is a lot less.
Rodriguez reportedly screened the film in polarized (clear glasses) 3-D at an IMAX theatre in Austin for the premiere the other night. It is unclear whether it was digital 3-D or an actual IMAX print, but I'd bet on the former.
I guess the kids and me will get stuck seeing it in anaglyph form, at least for now.