Tekken titles are normally developed on specialized arcade boards that are based on PlayStation hardware, Tekken Tag 2 for example is developed for System 369. And if this new information that was recently put out onto the internet is to be believed, it seems like Tekken 7 is soon to follow this tradition. According to a 2ch post, a new Namco Bandai Arcade system titled "System 478," (based on PS4 hardware perhaps?) is soon to be made and features several games for exhibition such as Tekken 7 & a new game in the Gundam VS series. Since I haven't received any official word from Namco about this yet, I'll put this under rumor. You can see the original source below.