Grand Theft Auto 5 is slated to release this November for Xbox One and PS4, with the PC version out this January. Whether by coincidence or not, the current gen release will mark more than a year since Heists were announced and not released.
Well, people are still waiting on Heists. Still waiting, the GTA V hardcore fans that are still playing it have taken to scouring the internet for any hint at the forthcoming Heist missions.
One user of the GTA Forums apparently stumbled across some source code that lists a number of achievement and trophy related coding such as;
[0x02084EA9]
GTA Online: Complete a Heist finale without anyone dying.
[0x02814D53]
You completed a Heist prep mission.
Since then however the original article source has been taken offline, so perhaps its best to take this information with a huge handful of salt. Stay tuned for more details but as always, wait for official confirmation from Rockstar.
[Source]