No definite time frame on the patches availability
Rockstar announced last night that GTA Online will be getting its first patch today. It's unclear exactly what the patch will handle, but it's expected to help patch flaws that have seen people lose money on cash cards in the game. There have also been reports of vehicles disappearing from virtual garages.
However, it's unclear if the patch will address the missing vehicle issue. That issue was reported to happen when players got into a vehicle and completed a mission, vehicles would then disappear from their virtual garage.
Rockstar has had the micro-transaction function in GTA Online disabled. It's unclear if the patch will bring those micro-transactions to the game or not. The update is expected to hit the US sometime today, but no specific timeframe was offered.