Granted a bit of the framing might be off but if they had put out a 1:85.1 release it would have just been the 4:3 release we have with sections of the top and bottom masked, sure some fans are already hard at work doing their own "Widescreen" version on their computers by doing just this.
This is the last I am going to talk about the aspect ratio (he says and 10 minute later there will be 10 more posts

) the issue isn't that it is in 4:3 or wanting to watch it widescreen, its that it is a odd decision to begin with. How many times will the average person see this in a IMAX? How many people have IMAX screens at home? It seems like people are talking more about this then the actual film.
I can't see the benefit of the the taller framing, directors have been using 1.78:1 for decades to frame taller is they need to (even Spielberg or Jurassic Park). If he had just filmed this at 1.78:1 or 1.85:1 no one will be saying oh I wish I could see more of what's going on at the top or the bottom of the frame.
If the movie is in 4:3 I will watch it that way no way will I zoom and stretch, but still think its a gimmick and not a good one.