"Fallout 4" fans are fully aware that the "Nuka World" DLC is the last one in the game. However, fans are speculating that there is another one in the works with a recent discovery.

A game fan named HarraReeves recently discovered a posting on SteamDB about a possible expansion pack for the game. It is only identified as "SteamDB Unknown App 540810," and it is listed under the DLC category. The page only offers basic information such as the app ID and number, developer, publisher, and date uploaded, but no specific details like a description were provided.

Several Reddit users are speculating that the mystery DLC could be related to the VR (virtual reality) support that could arrive for the game. Bethesda, the game developer and publisher, has already mentioned before that several of their games will be playable in a VR environment.

Some are also of the opinion that the posting could really be a DLC which is some kind of a bonus content because of the many complaints that the company has received. Fans reportedly complained about the unworthy content of the Season Pass.

Additional 4K graphic support or similar to Gun Runner's Arsenal DLC for "Fallout Vegas" were also speculated upon.

Meanwhile, PlayStation 4 fans waiting for "Skyrim" and "Fallout 4" mods will soon receive them. PlayStation 4 Pro will also be supported by the games that the company made.

The company said in its announcement last week that "Skyrim" will receive the mod feature on Oct. 28. The additional power provided by the latest Sony game console will also make the game even more stunning with its native 4K resolution support.

It also added: "Mod support will come to Skyrim first. We and Sony have worked hard to make this possible. Mods on PlayStation 4 will allow you to modify and create your own content by using our Creation Kit available here. You will not be able to upload external assets with your PlayStation 4 mods, but you will be able to use any assets that come with the game, as most mods do. By creating a Bethesda.net account, you'll be able to browse and try mods right from within the game."

A "Fallout 4" mod release will reportedly happen after "Skyrim's" work is complete.