What did Obama mean when he said he was putting an end to war crime trials? And closing Guantanamo Bay?

I think it's about time, we all deserve to know the truth once and for all about one of the most tragic days in History! But something bothers me, I just read that the plotters to 9/11 are rushing to confess before Obama took office. Why? How are war criminals going to be dealt with? Is Obama going to become judge, jury and executioner? And now Castro wants to talk with Obama. If Guantanamo Bay is closed, wouldn't all those little Mediterranean Islands be in jeopardy? And why before Obama takes office?