I really enjoyed the song. I think it's a good movement for them, their sound is changing a little bit. It'd be easy to get stuck in a rut with the sound on Hopes & Fears. Brooding is a perfect word for the track. Video was kind of creepy, not sure I understand the entire thing, but I don't watch videos often so I won't have to see it again most likely. I do like the track a lot though, and I'm really excited about the album.
And, no, the 'Is It Any Wonder' video's track looks nothing like an ellipse. That's got to be one of the worst observations I've ever seen on this site.