I'll Give You the Sun by Jandy Nelson: I need to read this immediately because I loved her first novel. It's about a relationship between twins who have grown apart, and I'm 90% sure it'll make me cry.
Red Rising by Pierce Brown: I've been in the mood for a good sci-fi novel, and this one has gotten a lot of notice. It's the first of a larger trilogy (the second book was just released in January).
Rooms by Lauren Oliver: Another one of my favourite YA authors. I'm really curious to see her write something different - this one's a family drama with a kind of paranormal twist.
The Girl on the Train by Paula Hawkins: This is supposed to be the year's new Gone Girl, which I really enjoyed. A woman witnesses something shocking on her daily commute and becomes implicated in the lives of two strangers.
The Cuckoo's Calling by Robert Galbraith: I loved Rowling's other adult novel, so I'm really excited to see how she handles a mystery. This one's also part of a larger series (she's stated her plan for at least eight Strike novels).
The Way of Kings by Brandon Sanderson: So many people have recommended this author to me, and I'd really like to try an epic fantasy that's not Game of Thrones. It's a ten-part series, with the third book expected to come out next year.