Rockstar Games announced a new unusual challenge in GTA Online. To take part in the challenge, you must perform heists this week including Lester heists released in 2015, the Doomsday heist and the Diamond Casino heist. If players will be able to steal GTA$100 billion, the developers promised to provide a unique vehicle to all of GTA Online players along with the winter update.
The new construction was set up just outside of the Diamond Casino. This might be a teaser to the upcoming update. Similar method was used shortly before the Diamond Casino & Resort update in 2018.