Import/Export was an "ending" DLC in many ways. It ended GTA Online's run for 2016 in terms of new content and it also might have ended the long-standing trend of leakers discovering data about upcoming updates based on data mining. Either that, or they're keeping the info to themselves.
Rumors and leaks have been a part of the GTA Online culture for almost as long as the game has been around. Everytime a new update is released, the folks on PC would fiddle with the game-files in ways they're not necessarily supposed to, and soon images of 3D models would be published on various sites.
These screenshots are usually accompanied by descriptions of features, such as new jobs and Adversary Modes, which have been deduced from other data discovered in the game files. Such discoveries, usually proven with screenshots of unused assets, are the ones which turn out to be true.
Of course, occasionally leakers make crap up as they go, hoping that their BS won't be called out simply because they have found a stray 3D model to back up their guesswork. We've said many times before, no source other than Rockstar itself is to be trusted regardless of how legit it may look from the outside.
But how do these leaks even happen, anyway? Well, the answer is pretty simple: optimization. Rockstar wants to make things easier when the update itself actually launches and makes use of these mysterious assets by pre-loading a chunk of them. The pre-loaded assets are then used for testing purposes, as well as the implementation of any code that needs be added.
Later when you're downloading a 'new' DLC, you're actually just filling in the missing spaces left behind by the preloaded content. All the while the next update you don't even know about is being quietly set up in the background too.
"But wait, if I'm downloading half of the current DLC and half of the next, in the end, it's not a smaller download, so how does this help me?" I hear you ask, and a valid question it is. See, this method doesn't necessarily help reduce download sizes and times, but instead helps ensure stable launches.










