Just few clues two hours before the official announcement - the above screenshot was taken from photoclubalpha.com - it seems that they have schedule a post to go live at 5:00am GMT (midnight EST). If you go to the actual link (http://www.dphotoexpert.com/2013/09/19/nikons-aw1-is-set-to-make-a-splash/) you will notice that the URL contains the words "Nikon's AW1 is set to make a splash". This pretty much confirms the previous rumors that a new underwater Nikon 1 camera will be announced today. FYI: the Nikon Coolpix rugged cameras also carry the AW model name.
Update: see this post for more info on the new Nikon 1 AW1 camera.