At long last, Rockstar has revealed more concrete details about what they have in store for GTA Online's future, and it's quite a bit. They've seemingly settled for two recurring DLC themes now, with both Cunning Stunts and the CEO theme continuing into 2017. The recently added new set of Stunt Races will be joined by further updates in that vein, and enterprising business owners will have a new way to make black market fortunes come summer.
Overall, the Newswire post which describes all of this is little more than a tease, but its good to have some kind of idea what to expect and when. 2017's first truly major DLC will be released sometime this month, possibly on the 14th, since the current Stunt Race Event lasts until the 13th, and the 14th happens to fall on a Tuesday which is traditionally DLC release day for GTA Online.
The new update will be called Cunning Stunts: Special Vehicle Circuit, and will introduce special stunt tracks designed with three of the special vehicles in mind that were added to the game with last year's final DLC, Import/Export. The fan favorite Rocket Voltic, fan favorite runner-up Ruiner 2000 and the (my personal favorite) Blazer Aqua will all get a host of special stunt races.

Players will use the jet engine strapped to the rear of the Rocket Voltic to clear jumps of previously insurmountable distances, switch between land and sea with the Blazer Aqua and use the various gadgets hidden in the Ruiner 2000 to tackle new courses unlike anything we've raced on before.
Back when Cunning Stunts initially launched, players had to wait a whole year before gaining access to the Stunt Race Creator. This time, the creatively wired among you won't have to wait so long, as the new props introduced with Special Vehicle Circuit will instantly be available in the creator for you to mess around with.