|Malaysian 747 (Photo credit: allenthepostman)|
Whether any of it will ever be recovered still remains tone seen. (It's still a bog world, no matter what we say.)
Will there be debris? Could depend on the angle the plane hit the wall of water and lots of other dynamics. Just look at what happened on September 11, 2001, when one of the hijacked jets hit the Pentagon:
The virtual disintegration of the airliner has led conspiracy theorists to insist the Pentagon was hit by a missile, not a plane.
I believe (and hope) that they are wrong. But I can sympathize with their conclusions given how little was left of the aircraft.