Liberty City, the setting for GTA IV (and several other Grand Thefts Auto), is coming to the latest in the seminal open-world franchise, thanks to Russian modders Open IV.
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A new trailer gives a tantalising glimpse of what they're aiming to deliver. A Titan transport plane lifts off from the player's airfield in Blaine County, and flies out over the sea towards the concrete jungle of Liberty City. When the mod is ready, it looks as though you'll simply be able to fly (or sail) across the water and land in a second city.
Open IV say in a helpful FAQ that the ambitious project has been underway since the initial release of GTA V. With respect to a release date, they are “trying to make first release as soon as possible but currently we do not have information [about] when it will happen.”
Open IV have got around legal issues (and cut down on the presumably incredible volume of work) by using an automatic converter tool, which will transfer Liberty City "from your copy of GTA IV into your copy of GTA V." You will need to download this converter and some additional assets. It will then create a single-player DLC pack, which will be installed to GTA V.
This will make yet another single-player explansion developed by the community without anything similar from developers Rockstar - a fact which Open IV were happy to point out on Twitter shortly after their announcement.
Rockstar had all the time and resources to make SP DLC or real map extension for GTA V. They choose shark cards. https://t.co/Ug82Fy85mX— OpenIV (@OpenIV) 1 January 2017
Open IV promise the mod will be compatible with Episodes from Liberty City. You won't be able to use this in GTA Online, since Rockstar doesn't allow mods there, and will almost certainly get banned if caught.
More information is coming soon, say Open IV. In the meantime, if you’d like to see the same project done the other way around, here's 28 minutes of gameplay in Los Santos, but in GTA IV. For more on that, check out this thread by modder VilV.