The world has been waiting for the announcement from Bethesda regarding Fallout 4, but it looks like those days are numbered. The developer has filed for a trademark application for Fallout 4 in Europe.
Of course, this doesn't mean it's going to happen, or we'll hear of something, but remember that IGN reported a teaser website that was uncovered by some keen-eyed Reddit users. Again, this doesn't completely prove the existence of Fallout 4, but it gives it more credit than nothing happening at all. We will have news of Fallout 4 as soon as it breaks.