The Denver signing report isn't up yet on Arcanum, but my first question was pursuing my long-time theory about Hoid using the lerasium to rewrite his Spirit Web in ways other than only getting Allomancy. For the first time, though, Brandon seems to have shot it down: he said that while it's possible to alloy lerasium with another god metal and get access to other Invested Arts that way, Hoid has not done that—and that there were several things preventing him from doing so.
Bummer to lose my theory, but now I'm really curious about what might have prevented him.