Luas has said repeatedly that the OT would never be released, that 'they don't exist any more' which is crap cos the AFI has a copy of the OT pre SE changes. (late 90's the AFI asked Lucasfilm for a set of star wars, empire and jedi for inclusion in the national film archive. the story goes that lucasfilm sent 97 SE's of the films and the AFI sent them back, saying those were not the films as they were originally released. so apparently lucasfilm sent them original reels.)
anyway, it's been stated too many times now by lucasfilm for them to do a 180 and release it I think.
being amercia, they could get slapped with a class action by loads of people saying 'I only bought this set cos you said the originals were never gonna get released'
lots of corporate embarassment, won't happen.
I'd like them too, but it won't.