Seems like a new trends and a Crush thing. Weezer released a single before they even wrote the other songs for the album! I remember when Good Charlotte made their second to last album, they released a single like a year ahead of it. I don't understand the logic, but it's becoming a thing. Just seems dumb because you want to release with some momentum. Most casual fans probably have forgotten by now. My thought is that they are trying to build up pre-orders so they can advertise a big first week sales total.