Tekken director and chief producer Katsuhiro Harada is going to announce something at Tokyo Game Show on Saturday, September 18th (tomorrow). He announced this via his Twitter account. Here's what he said, although it's redundant now:
TGS Sep 18(Sat) at Tougeki Booth. I'll announce something :D
It could be related to the next Tekken title or Tekken X Street Fighter. If it is not about one of those two, we'd be surprised. We'll keep you posted.