I believe that two of the best physical minds, Stephen Hawking and Kip Thorne, have running bets as to the outcome to this problem. A Schwarzschild metric is just a simplification of Einstein's theories assuming that the black hole is not spinning and has a neutral charge. It is the simplest case to work out. A Kerr metric introduces rotation, and is more complex to solve. Most astronomers don't bother with the Kerr-Newman solution, since all known large objects in the Universe are have no significant charge to them.
Gravitational waves carry gravitational energy away from a system.
Two scientists named Hulse and Taylor discovered two pulsars orbiting around each other. They discovered that the two pulsars are slowly moving closer together, which means that gravitational energy must be leaving the system. The amount of energy seen to be leaving the binary pulsar and the amount of energy predicted to be produced by gravitational waves matched, and so it is virtually certain the gravitational waves exist. For this Hulse and Taylor won the Nobel prize. Other information, such as the types of particles that fall in, currently seems to be lost forever.