User blog comment:Sammyrock0087/Heist Update is GLITCHED TO SHIT./@comment-25261281-20150311214819/@comment-4143911-20150311215148

The "New Vehicles" that have been added to the properties should be the Hydra, Savage, Kuruma, Valkyrie, Enduro, Insurgent etc. Basically all of the DLC vehicles (going on past updates, all DLC vehicles are instatly accessable to the Offline Characters so you can 'test' them before buying them on GTA Online) So all the Heist DLC Vehciles SHOULD be in Singleplayer, but due to a glitch they're not.