Taylor has already in her third album "Speak Now" more concerned with pop music and create brilliant songs like "Better Than Revenge" or "The Story Of Us".
And "We Are Never Ever Getting Back Together" is a cool, memorable pop song, which is not easy but just a pop song, but Taylor Swift's creation.
Taylor has cooperated for this song with two other musicians, the same goes for "I Knew You Were Trouble", who probably like pop influence.
I find good that Taylor can also make really good pop music, but I'm hoping that "Red" is not just a pop album, but a "Taylor-Swift-typical" album with a lot of variety is;)