The URL has the phrase "Subaseka," which suggests that this will be related to World Ends With You (known in Japanese as Subarashiki Kono Sekai.)
Thanks to @Tsunamo for that!
has gone live that teases an impending announcement about The World Ends with You.
The game isn't explicitly name checked but everything about the site points towards 2008's acclaimed action RPG, from the font used for the countdown clock, to the music and the silhouetted cityscape of Shibuya. At the bottom of the page, it even says the character design by Tetsuya Nomura and Gen Kobayashi – the two artists who worked on the original title, as well as Kingdom Hearts and Final Fantasy franchises.
At the time of writing the clock has 6 days and 14 hours remaining. So expect more information to be revealed at the beginning of next week.
The World Ends with You was released on Nintendo DS in Japan back in 2007 and was localised for Western markets in 2008.