The recent trailers give me hope. We'll finally see OurCaitlin, instead of a random person that shares her face, get icy superpowers. Hope they'll keep her brunette for the sake of distinction between two Caitlins. Also hope she'll retain her banter with Cisco, and we get something like

CR: "Why do you still call yourself Killer Frost when you aren't actually killing people?"
KF: "Cisco, it's a metaphor used to describe an especially freezing feeling of cold, it doesn't necessarily mean that-"
CR: "Yeah, but you're still not killing people."
KF: "I'm getting inclined to start."

Finally, more funny faces from Danielle Panabaker! Now, with extra frosting!