Fallout 4 will be set in Boston, according to an alleged MIT student. He has explained that Bethesda is currently researching the Boston area.
Speaking on Reddit, the tipster explained, "The rumors are true, Fallout 4 will take place in Boston. In case you haven't heard, Bethesda has recently been scoping out and researching Boston. They also have a strong connection to MIT. I may or may not be an MIT employee. But that's really all I can say for fear of losing my job."
The anonymous insider added, "Apologies for the vagueness of this post. It's not just my job that worries me, but also getting the f**k sued out of me. Bethesda's contracts are basically full-proof [sic] so if they were to discover who I am, or rather, who I got this information from, a few people including myself could get into a lot of trouble."
Another Reddit user backed up his claim, "I've been hearing reports from people in the Boston area, where my fellow Fallout-obsessed brother lives, that Bethesda has been in the Boston area doing initial research for Fallout 4. It's highly speculative, but the main rumors surround Bethesda's connection to "The Institute", or what we call the Massachusetts Institute of Technology, or M.I.T."