The 'amazing' new evidence is about how the hull separated (below the water line) from the bottom of the ship, which is now believed what caused it to sink in as little as 5 minutes, versus the original thought of 20 minutes for it to sink.
The ship broke into 3 pieces. When they found the wreckage, they had assumed the missing section had been obliterated, but it was discovered some 900m from the original site, in tact.
As the aft section was rising due to the fore section sinking, the stress caused the ship to break, the lower hull section did not break, but instead it tore apart from the fore and aft section on either side of the break and dropped away from the ship.
This allowed a massive amount of water to enter, rather unimpeded, and sink the reamaining aft section very quickly.
But thank you for the heads-up SuperDud.