Is the Fallout 4 trailer real or is it just a good hoax?

Welcome to the forum.

To answer your question, it's a fake.

Use this: http://www.gamesas.com/topic/1364939-fallout-4-speculation-suggestions-and-ideas-thread-59/ All things regarding Fallout 4 should go there.

Thanks for the re-direct.

We also have http://www.gamesas.com/topic/1361798-official-future-fallout-locations-suggestions-topic-14/ for discussing FO4 locations.