For now, give it a few more weeks and you will have universal on blue ray as well, disney, paramount at least will be doing hd as well.
Not one or the other but more will be doing both in a few weeks.
Universal countered rumours that they were going blu-ray only about a week ago and said they will not be supporting the format. Think Disney also put out a press release too saying that they are only doing blu-ray, however, in the past they have said they were looking at maybe releasing on both, plus they have very few releases lined up for blu-ray.
One of the things that makes the studio support argument not work is that fox and disney have postponed almost all of their titles indefinately. Fox had quite a few lined up but then cancelled all but a few and Disney just seems to be dipping its toe in the water rather than jumping in. So really the only exclusive studio that is really releasing content is Sony.
