Bethesda has confirmed it will host its first ever E3 Conference at the Los Angeles convention center on June 14, 2015. Such a huge event can mean only one thing, that something big is going to be announced. Could Fallout 4 finally be happening? Yes there's a chance we could be seeing a new Elder Scrolls game but that seems unlikely given The Elder Scrolls Online will have just been released on consoles and Skyrim only arrived four years ago. Considering the most recent Fallout game was released in 2010, I would say it's a fair bet a new Fallout game will be announced.
Source: Twitter (E3)