The Valentine's Day Massacre is a content update for Grand Theft Auto V / Online, being the first of 2014 and the second major content update since the Beach Bum. It will be avalible for free on the 13th of February as part of the 1.10 patch.
It includes multiple 1920's-styled content: A new weapon (The Gusenberg Sweeper), a new vehicle (The Albany Roosevelt), multiple vintage clothing, a Flapper Bob hairstyle for female characters and 10 new jobs.