Developers DICE never officially sanctioned the use of mods in Battlefield 3, fearing it could lead to stuff like exploits in multiplayer matches (which, you know, happened anyway). So has the studio reversed that decision for the upcoming Battlefield 4? Of course not.
Speaking with PC Gamer at E3, DICE general manager Karl-Magnus Troedsson broke the bad news in about as honest and up-front a manner as possible, which is at least something!
"We get that question a lot", he says. "I always answer the same thing, and then the community calls me bad names. We get the feedback, we understand it. We also would like to see more player-created content, but we would never do something like this if we feel we couldn’t do this 100 per cent. That means we need to have the right tools available, we need to have the right security around this regarding what parts of the engine we let loose, so to say. So for BF4 we don’t have any planned mod support, I have to be blunt about saying that. We don’t."
Battlefield 4 mod support ruled out by DICE [PC Gamer]