The ACLU says:
The worldwide war provision was added to the bill by the committee's chairman, Rep. Buck McKeon (R-Calif.), and goes much further than the current authorization of war. The new authorization would last as long as there are terrorism suspects anywhere in the world and would allow a president to use military force in any country around the world where there are terrorism suspects, even when there is no connection to the 9/11 attacks or any other specific harm or threat to the United States.
The world-wide war provision has no expiration date. It means the current and any future president can decide to go to war anywhere in the world without additional congressional authorization. There isn't even a requirement that the president show a threat to our national security.
The bill essentially mandates military detention for anyone who could possibly be considered an "unprivileged belligerent" (the new term for "unlawful enemy combatant").
On indefinite detention:
the President’s authority includes the authority to detain belligerents, including persons ... until the termination of hostilities.
Also, if I'm reading the bill correctly (and I read it quickly), once put in military detention, the detainee can't transfer back to the civilian courts.
No individual who is eligible for detention pursuant to the Authorization for Use of Military Force (Public Law 107–40; 50 U.S.C. 1541 note) may be transferred or released to or within the United States, its territories, or possessions."
It also has huge restrictions on the transfer of non-U.S. suspects from Guantanamo back to their home countries or third-party countries, including this one:
The Secretary of Defense may not transfer any individual described in paragraph (5) to the custody or effective control of the individual’s country of origin, any other foreign country, or any other foreign entity if there is a confirmed case of any individual described in paragraph (5) who was transferred to the foreign country or entity and subsequently engaged in any terrorist activity.
And those Combatant Status Review Tribunals (also known as CSRTs)? Who makes the recommendation? A panel of "operations, intelligence, and counterterterrorism officials". The detainee can't have a lawyer.
The Senate Armed Services Committee is scheduled to begin its markup of the bill on June 13.