Charles Stross's next book (described only by title and what it's not
here) will concern a system (probably highly-automated with distributed human components (possibly a hijacked altruistic distributed-computing platform) for generating arbitrary, high-quality, realistic pornography featuring arbitrary persons.
Said pornography will then be used for some kind of financial shenanigan -- either a major stock manipulation (most likely of a large entertainment company, but possibly of an insurer/bank by causing them to pay out completion insurance on a major production) or, for the weirder but smaller payoff, a move in the royalty backed bond secondary market.