"Please stand by".
With this image, teaser message and countdown site Bethesda has just confirmed the imminent unveiling of Fallout 4, with something (trailer? Teaser trailer? Teaser of a teaser?) to be revealed at 3pm BST today.
However long or short it is - it's due at 3pm GMT here - we at least now know for sure the game will appear during their E3 press conference on June 14.