We have recently seen two videos that were made by fans. The first was inspired by some of the darker themes in Elder Scrolls: Skyrim and the other took inspiration from Fallout 4 and is rather bloody.
Skyrim: Into the Void is a quality short movie that is about a Dovakhiin. This is a dragon slayer who is on the lookout for a cure for vampirism. So if you would like to see someone swinging a sword about at a tornado, check this out.
Fallout: Lanious is a more gory film with a gladiator vibe to it. This is different to the many Fallout inspired fan films and is well worth a look. Could it offer a hint of what we may see in Fallout 4? Perhaps not even close, however it is worth taking a look out until we get some news about Fallout 4.