You read that right, Vampire Weekend have indeed revealed a brand new track "Flower Moon" at a show in California. You can listen to a snippet of the song below, the gig also featured more new material however that wasn't recorded, although I'm sure we will have something new from them before the year is out.
VAMPIRE WEEKEND NEW MUSIC PREVIEW - FLOWER MOON:— Team Vampire Weekend (@teamvampyweeks) June 17, 2018
Today at their second show at the Libbey Bowl in Ojai, CA, Vampire Weekend previewed a snippet of a new song from LP4 called Flower Moon, which features Steve Lacy. https://t.co/lRibHKlZ6P pic.twitter.com/zKDWlrt5gO