With reagrds to the black box, i doubt they'll ever find it. Not only is it at a depth of anywhere from 7,000 to 14,000 feet, they managed to crash pretty much on top of the mid-atlantic ridge. The topography of the ocean floor at the crash site resembles a mountain range. Toss in the fact that the floor is constantly shifting/moving with the new crust constantly forming, it'll be a stroke of pure luck to find the black box.
The crust moves at best about 1/2 in per year. The "black" box has a battery lifespan of about 30 days.