GTA Online has had a rocky start, to say the least. After a number of bugs and connection issues plagued the game, Rockstar started working on fixes, as well as a bonus called the "Stimulus Package," which would grant players tons of free cash as an apology. That package was subsequently delayed for more bugs, but now, it should be coming next week according to Rockstar.
In addition to the Stimulus Package, the "Beach Bum Pack" is also on the way, which is the first major content update that adds new vehicles and weapons for both GTA Online and GTA V proper, as well as a few new modes. The Content Creator is still in development, and will arrive this fall. All the DLC announced so far will be free.