Posted? Trailer for the 3DS Project X Zone game:
http://www.youtube.com/watch?feature=player_embedded&v=uMcMpAc1Ppg
That likely has nothing to do with this game. That's being published under the Banpresto label of Bandai Namco, and has been known for months.
Edit: For the new page:
The SWF file is named "countdown01" which leads me to believe that in 3 days we'll just get a new image added to the puzzle. I took a look at the source code, and the SWF file itself:
Nothing in there points to an obvious answer. The sunrise image doesn't match the one from Smash that was posted here.