That's the same question I want to ask. I watch the film (the single disc version) with a widescreen TV and it's just look so weird. The black bar at the top and bottom of the screen is too large, and when I zoom it, the second line of the subtittles is gone. The picture is also in a very poor quality. I wonder if someone can reply to this post.
All existing regio 2 and region 1 versions of the Abyss are non-anamorphic, which was common for the early DVD releases upto about 2000. This means that you will have to zoom in to get a good picture on your widescreen TV, and that subtitles may drop off the bottom of the screen. On some models (e.g. Philips DVD player which I have) you won't be able to get a decent picture at all, but only a horizontally stretched one. It's best to wait for a new anamorphic release. No idea when this would come out.