Bruce introduces what I considered a very interesting concept, which may be old news given the book came out last year, but I do not recall seeing it discussed. He suggests the holographic principle may provide the answer. If the amount of information a region of space can contain is proportional to surface area, might the "volume" contain subinformation of multiverse processes? To quote Bruce: "Perhaps a cube 10^100 Planck units on a side can indeed store about 10^300 bits of subinformation or multiverse information, but this capacity has to be divided between 10^100 world processes, giving only 10^200 bits of stable "real" information capacity to each."
Bruce admits this is a speculative idea, but provides explanations as to how it is an interpretation that explains several aspects of our universe. I will go into more detail about this if anyone cares to hear.
I must admit I'm biased here toward liking the idea because this directly addresses several key questions I have had about the structure of the multiverse, including the relevance of the holographic principle to the MWI. Anyone care to weigh in on the prospects for Bruce's idea?