[biot]

This isn't a particularly new twist. The idea of our universe coming from a black hole has been around for quite some time, as this 1998 article discusses:

http://martinelli.org/rexpansion/bhole.htm

  "if we run time forwards, we can kind of visualize the beginning of
   our universe as a very rapid collapse (the inverse of "Inflation").
   A similar kind of event happens when a star (hot, spherical,
   massive, dense...) becomes so dense and massive it collapses in on
   itself and forms that mysterious black hole.  Here's an interesting
   question to explore... "Did our universe begin as a star that
   underwent a gravitational collapse?"  I.e., do we live in a black
   hole?"

Perhaps the novelty is a formal theory around the idea?