Rocket League upcoming patch will bring up more game stability and fixes that would reduce PS4 fan noise. The patch is carrying some update related to visual optimization as well. That will automatically reduce the fan noise. When the fan noise is high this simply means the PSU is heating. And due to overheating the fan speeds up at faster RPM. Overall this is not a major issue or can cause any kind of hardware problem; it is an internal mechanism that is built to tackle the heat. For Rocket League the issue was a bit common and the next patch is going to resolve the issue by offering few visual fixes. The patch release date is not yet confirmed but we will get this soon. Also the patch carries fixes that deals with game crashing issue. With this we had found that in coming days the game might also get a DLC.
But most probably the patch will be released and then the DLC will be released. The patch fix is a kind of essential part right now. That is because it is going to resolve a lot of issues in this game. We are waiting to get bit more details about the patch log so that we can find what all fixes this one is going to add. Rocket League is quite a popular game after its launch. There was also patch released recently that resolves long server wait time issue and many other fixes. The new patch might be released in upcoming weeks.