This has been happening for a while now, but as we're getting more and more information on the game, this is the thread dedicated to Fallout 4 news stories.
(yes, I realize this is a Fallout 3 image with "Fallout 4" written on it, will change as we get more stuff on Fallout 4)
Voice Actor Teases Fallout 4 @ Gamespy.com
Fallout 4 Teased by Three Dog Voice Actor @ IGN
Three Dog Teases Fallout 4 @ Escapist Magazine
3 Things I'd Like to See in Fallout 4 @ Forbes