In a nod to placate and make happy the far left Western civilisation hating kooks that helped get him elected, President Obama gave them one of their fondest wishes. Club Gitmo will get shut down. Even as he was signing the Executive Order shutting the place down he wondered aloud what will they do with the more dangerous ones. The answer from one of his psychophants was 'we are working on it.' And he still signed the paper. Thus proving Obama is all about style and not the substance of actual thinking about consequences.
While the Obama Administration mulls over what to do with the dangerous ones, lets look at the other two types to emerge from Gitmo. The ones sent to other countries and the ones sent into the US prison system.
First type might get handed over to the likes of Saudi Arabia or Egypt. In the Kingdom of Faud, we might see more of what has already happened. A former Gitmo detainee run through their system of re-education, released, and then rejoined the fight to spread Islam by the sword or IED or AK-47 or bomb-vest. AQ's branch chief in Yemen is such a person. Now Egypt is more simple and more complex, it all depends if President Hosni Mubarek needs the Muslim Brotherhood for anything. So the returned detainees could be tortured never to see the light of day and then suddenly released to fight again.
Now the second type is more interesting and possibly grave enough to turn one's hair gray, assuming one lives. Now suppose one of the dangerous types has slipped through all the screening and is now dumped in an American prison. I will let you the dear reader who has a surfeit of being smacked by reality to contemplate a radical killer amidst other killers in a penal system with so many rights for the prisoner. The term powder-keg springs to mind.
That is the possible future that awaits us all due the stroke of one pen by one man.