It looks like Twitter user Funmw2 may have uncovered the various gear and vehicles players will be able to use once Heists is finally released for GTA Online. Outside of the objects players can use some other things that will be new, according to the leak, are characters and potentially an extra heist for last gen.
Now, none of this has been officially confirmed by Rockstar and it is likely that the studio won’t verify until it is ready to do so. The pictures below do show the vehicles and gear that players may get to tool around with though, as well as the extra characters.
Source: Funmw2 Twitter