It has been a long time since there as been a big DLC for Grand Theft Auto Online. I was guessing they would be holding off until there next gen version of the game. Well I was wrong. Last week they announced The Cayo Perico Heist. This is a pretty big deal because it is adding a new location to the game. Another big change is this heist is it can be played solo. All the other you needed four people. There is not much more to go on just let. There is the article linked above and a teaser trailer. Which you can see > here or below. This update is set to be out December 15, 2020.
