Bethesda's Vice President of Public Relations and Marketing Pete Hines stays true to tradition with the company, pronounced moddability as still an uncertainty for the game on PC.
With the debacle of Paid Mods still fresh on our minds, and the announcement of Console Modding for Fallout 4, uncertainty is yet again the name of the game. In the past, modding tools for Bethesda's well-known game series Fallout and Elder Scrolls have always been followed with delay or uncertainty, with Fallout 4 joining the tradition. Earlier Hines had already confirmed that "[their] plan is to use Bethesda.net".
Further pressing reveals that "[they] have a lot to figure out first on mods." This could mean that something special could be awaiting PC players looking forward to modding their Fallout 4 game. In the very least it points toward something that requires consideration and may prove different than what we are used to. Hines also cleverly deflects answering whether Bethesda.net will be the sole (forced) proprietor of Fallout 4 PC Mod distribution, asking fans to trust them because of the 13 years of mod support they've offered.
The uncertainty game has been played before with Bethesda's game. Since Morrowind, modding tools were an uncertainty. And each and every time it did get delivered. But with the Skyrim Paid Modding debacle, Bethesda had shown its ambitions. The phenomenon it had for so long just nurtured was now something they apparently wanted to cash in on. Bethesda.net might service this for their Console Market, perhaps functioning in a manner similar to Steam Workshop does for games such as Killing Floor 2, DOTA 2 and Team Fortress 2.
This could be a genuine point of worry for PC Modders, as the modding tools could for example could only save/upload to Bethesda.net, leaving other modding websites in the cold. Or worse, the extent of modding could be simplified, limiting how far a mod can reach or what its scripting could do. Bethesda opting to implement their own modding platform certainly seems like a move toward more control for them. So far, this is all speculation, and I sincerely hope that I'm wrong.