Disney has released a new Frozen II trailer. The upcoming sequel sees Anna, Elsa, Kristof, Sven, and Olaf going on a new adventure to discover the source of Elsa’s magical powers. What's interesting about this trailer is how it looks like they're going all in on the adventure aspect. There's no humor here, no Olaf throwing in little jokes (maybe Olaf's Frozen Adventure was an even bigger debacle than we realized), and the focus is firmly on Elsa. And perhaps moving away from the childish stuff makes sense when you realize that people who were …