Well I've heard it might be released in 2007, but for your sake let's hope that that might only be the Aussie release date.
The thing is, I don't think Namco have announced Tekken 6 yet. I've heard more reliable rumours of TTT2 for PS3. And yes I have seen the PS3 clip with Jin sweating like a dog; I doubt that's Tekken 6.
Perhaps someone with more insight would like to inform us, 'coz I personally can't wait for the next Tekken Tag or Tekken 6!