The documents sent were from a casting call for a project that was given the “Institute” codename, and while it does not mention Fallout specifically, there are several references made in the script and the location that has led Kotaku to believe that this could be Fallout 4-related, not to mention the casting director has also worked on other Bethesda games in the past, such as Dishonored and Skyrim.
However without Bethesda actually announcing anything, it’s hard to say if this casting call is indeed for a Fallout 4 game. However given the casting call, it would suggest that the game could be in its early stages of development, which could explain why Bethesda has not said anything yet. Either way try not to get your hopes up just yet, but we’ll keep our eyes peeled for more info.