Full details of this have still to be published, and you can bet the maths will be extremely heavy!

However, what he seems to be saying is that the event horizon does not work in the way that is accepted at present - in other words matter sucked into a black hole can (does?) get emitted in some sort of recognisable form at some point in the future.

His new theory also balances out the contradictions with quantum theory, and means that there is no need to have alternate universes to explain what happens to all that matter.