I don't know if anyone else has noticed but both Elain and Azriel's other love interest are both redheads with connections to Spring, Autumn, and quite possibly Day as well. Obviously, Lucien is the son of Lady Autumn and Helion of Day and was Emissary of Spring. In Gwyn's case, from what we know, her grandmother is a River Nymph from Spring and her grandfather is a High Fae from Autumn *cough* Eris*cough* which obviously resulted in her mother but her mother met High Fae male she doesn't remember really which resulted in Catrin and Gwyn. I personally believe that Gwyn's father is from Day (or Dawn or both) because she has the ability to glow albeit when she sings. So I feel that we're going to learn more about Elain's seer powers as well as any others she may possess, Azriel's shadowsinger powers, Lucien's day court powers, and Gwyn's power because i feel she may be more powerful than we believe especially since she's descended from multiple courts if my day court theory is true. As well as learning more about their pasts and families.
Let me know what y'all think.