The article states most of the evidence they plan on using was obtained before he was taken into custody. I can’t imagine bringing charges when the outcome would be in doubt. There will be a lot of fireworks about coercion and such by the defense, but if all the evidence predates any possibility of that (he wasn’t in our custody), it’s just a show.
The actual reality is, even if he’s found not guilty, they can still send him back to Guantanamo. Not that Obama would do that for political reasons (Bush would), but even still, no country is going to take him, so he sits and waits in jail for extradition until he dies of old age. So, guilty = jail/injection, not guilty = jail. Yay for Justice!