To me it seems as if the major difference between the Bush and Obama policy is that Obama is giving them status as prisoners of war and explicitly making thier captivity subject to the accords of the Geneva Convention. I still don't know what this will turn out to mean in terms of practical difference, though.
To them, possibly not much, because the Constitution has already been trampled on so much by the previous administration. But it's a very encouraging precedent.
For example, Texas points out that the prisoners have the right to challenge their detention in court, courtesy of a SCOTUS decision. Had the prisoners been given POW status, such a status hearing would have been automatic and provided within
days of their capture, not after a delay of 5+ years.
Furthermore, he also neglects to mention that these status challenges were granted only by a SCOTUS decision over the active and systematic opposition of the Bush administration.
This is therefore already a major shift from the Bush administration; the Obama administration acknowledges that they are being held as POWs, which gives them a laundry list of rights that Bush has systematically denied and violated, many of which have not (yet) come up in court. For example, the Geneva Conventions explicitly state that "prisoners of war must at all times be protected, particularly against acts of violence or intimidation and against insults and public curiosity." (Article 13) This goes far beyond legalistic arguments about "torture"; the well-publicized Koran burning violates the GC.
Similarly, "no physical or mental torture, nor any other form of coercion, may be inflicted on prisoners of war to secure from them information of any kind whatever. Prisoners of war who refuse to answer may not be threatened, insulted, or exposed to any unpleasant or disadvantageous treatment of any kind." In other words,
you can't even be unpleasant to POWs in an attempt to get information out of them.
Prohibiting detaininees from contacting the outside world or holding them incommunicado is likewise forbidden: "Prisoners of war shall be allowed to send and receive letters and cards. If the Detaining Power deems it necessary to limit the number of letters and cards sent by each prisoner of war, the said number shall not be less than two letters and four cards monthly."
Also: "Prisoners of war shall have the right to make known to the military authorities in whose power they are, their requests regarding the conditions of captivity to which they are subjected.
"They shall also have the unrestricted right to apply to the representatives of the Protecting Powers either through their prisoners' representative or, if they consider it necessary, direct, in order to draw their attention to any points on which they may have complaints to make regarding their conditions of captivity.
"These requests and complaints shall not be limited nor considered to be a part of the correspondence quota referred to in Article 71. They must be transmitted immediately. Even if they are recognized to be unfounded, they may not give rise to any punishment."
Do the Gitmo detainees currently have the unrestricted right to communicate with the Red Crescent?
Does the Red Crescent even have the authority to enter Gitmo without restricted? The GC says it does: "Representatives or delegates of the Protecting Powers shall have permission to go to all places where prisoners of war may be, particularly to places of internment, imprisonment and labour, and shall have access to all premises occupied by prisoners of war; they shall also be allowed to go to the places of departure, passage and arrival of prisoners who are being transferred. They shall be able to interview the prisoners, and in particular the prisoners' representatives, without witnesses, either personally or through an interpreter.
Representatives and delegates of the Protecting Powers shall have full liberty to select the places they wish to visit. The duration and frequency of these visits shall not be restricted. Visits may not be prohibited except for reasons of imperative military necessity, and then only as an exceptional and temporary measure."
So I think it's a significant change....