DICE has been avoiding the question of Battlefield 3 mod tools on the PC ever since the game was revealed, often giving vague answers like “we don’t know” or “nothing has been announced”.
It’s going to be very difficult for people to mod the game, because of the nature of the set up of levels, of the destruction and all those things… it’s quite tricky. So we think it’s going to be too big of a challenge for people to make a mod.
DICE previously stated a number of reasons why Bad Company 2 didn’t have any mod tools,chief of which was that it too was complex. Furthermore, the Frostbite engine features a number of licensed third party technologies,which DICE cannot give out for free with mod tools they’ll have to get another, much more expensive license in order to offer mod tools.
While it’s easy to get disappointed at DICE for not offering mod tools, bear in mind that the Frostbite engine is very complex, with its physics, destruction, animations, lighting and so on if it’s complex for professional developers like DICE, it’s probably complex for modders as well. In the end, DICE main objective is to deliver a great game first, and who knows, maybe we’ll see mod tools for BF3 one day.