From many things I've seen lately I believe Taylor's 5th album will have more of a rock vibe. I'm not talking full on rock like Led Zeppelin or Red Hot Chili Peppers, I mean more of Fall Out Boy or Imagine Dragons. A pop/rock sound with hopefully some country mixed in. She has worked with Ryan Tedder from OneRepublic and recently tweeted this "One of the only unchanging things about my life in the last 10 years is my love of Paramore, Ingrid Michaelson, Fall Out Boy & Coldplay." Another reason is her style choices lately. You can make what you want of it but Taylor's style always changes to show off what kind of music she is singing and lately in my opinion she's had an edgier rocker vibe in her clothes. Only time will tell, and only Taylor and her closest friends and family know what album 5 will bring. Until then we will just have to wait.