It's been quite some time since a major GTA Online update but Rockstar has broken its silence with the announcement of not heists. Sorry.
Instead it's The San Andreas Flight School update. Expect new air and land vehicles, aerial solo challenges, increased payouts for harder missions, and GTA$ bonuses for playing missions with other players.
Okay, before you go unleashing your frustrations about heists in the comments I honestly think we won't have to wait much longer. I think Rockstar is going to hold back until the upcoming release of Grand Theft Auto V on PC, Xbox One, and PlayStation 4. If it's not out by then, well, then we can riot. Like, in the game I mean. Don't actually go riot over a videogame.