Rockstar said the update includes "fixes for GTA Online to improve stability, and other minor fixes for both GTA Online and Story Mode."
If you're playing Grand Theft Auto V on Xbox One or Xbox 360, Rockstar said that it's working on releasing the update on those platforms as soon as possible. To be notified via email as soon as there's more information about the update, log into Rockstar's support site and subscribe at the top of the page.
The Heists mode is described as "massive, multi-layered, 4-player co-operative missions" where players will work together to take on a number of jobs similar to the way they did in the main Grand Theft Auto V campaign.
There are five total Heists available in GTA Online right now including an "introductory" Heist that can be played by two people instead of four. For a full rundown of what to expect from Heists, check out the video above and GameSpot's previous coverage.