GTA Online received a Halloween update which includes some new vehicles (the Albany Lurcher hearse for $650,000 and the Franken Stange hotrod for $550,000) as well as other additions.
The update adds a new mode called "The Slasher" which has five maps to play through. Also included are 39 new masks shown in the video below, facepaints, bobbleheads for your lowrider and a flashlight. Since the content was hidden in the last Lowrider update, players wont have to download and will have access to the content right away. The Halloween surprise update will run until November 16 according to Rockstar.