The game is an original project being developed by Namco Bandai in collaboration with producers and developers of Tekken and Soul Calibur. It is a 3D fighter coming out in Japanese arcades in 2015. The game's producer, Katsuhiro Harada, has confirmed that not all fighters will need to necessary be Hero Pokemon (Hero Pokemon are what we know as Fighting Types).
Many people were upset by these news, I suppose their hopes were crushed since this is not a console game. HOWEVER, most tekken games first appear in arcades before being ported to systems later. Furthermore, the announcement trailer was in English and was posted on the American Pokemon Channel--As such, there is a very high chance this game will come to Wii U worldwide at a later time.
First Teaser Trailer