The text of [the parts I've read so far of] Superintelligence is really insightful, but I'll quote Nick in saying that

"Many points in this book are probably wrong".

He gives many references (84 in Chapter 1 alone), some of which refer to papers and others that resemble continuations of the specific idea in question that don't fit in directly with the narrative in the book. My suggestion would be to go through each reference as it comes up in the book, analyze and discuss it, then continue. Maybe even forming little discussion groups around each reference in a section (if it's a paper). It could even happen right here in comment threads.

That way, we can get as close to Bostrom's original world of information as possible, maybe drawing different conclusions. I think that would be a more consilient understanding of the book.