The Mistborn series was sold as three trilogies. The first trilogy (the one we know) is set in medieval/16th century technology and is fantasy. The second trilogy will be set in the current day, or at least with the same kind of technology. This makes it urban fantasy. The last trilogy will be science fiction set somewhere in the future. Of course, all of them have the Allomancy magic system to get things interesting. The short novel The Alloy of Law that will be released in the fall this year is set between the first two trilogies so the tech level is around 18th/19th century with steam power. Brandon said it was about some Wild West-like character getting involved in a murder investigation in a city. So Clint Eastwood meets Sherlock Holmes in London.
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