The song in question is called Get Lost and, even on this poor-quality radio rip, it's exuberant and intoxicating and (yes) shouty.
Debuted live on Thuesday night, the song was played on Swedish radio this morning and is apparently available on Swedish iTunes later this week.
Asked by a fan if it was going to come out in the rest of the world, they said: "We promise, just have to start somewhere. And it will be on spotify!"
The band also provided a sample of the lyrics written with a pen on a scrap of paper. How 20th Century: