game freak revealed in her website strange picture.

Fount serebii.net

The official GameFreak website has posted a strange picture of a silhouette with a caption noting that "the well known game, played all around the world, is about to be reborn thanks to a surprising collaboration". Now, this may not be regarding Pokémon, but rather another franchise that GameFreak is now working with, so don't take this as Pokémon at this time, but we'll bring news as and when it comes
It has been found that the URL includes the term Soritiba ソリティ馬, which was a trademark registered last year by Gamefreak.

official website http://www.gamefreak.co.jp/g2013/index.html

Thanks serebii for this info.