Tbh unless it's from an official DOA source I'm not buying it, I don't recall a doa leak besides the 2014 Halloween dlc one and I don't think they're gonna risk another leak. I need to really see to believeAs of September - the tweets of Hiroaki Morita make him a potential Team NINJA leaker.
He was correct about RONIN as it was announced earlier this week (to my knowledge it wasn't really mentioned by anyone prior to that) and he wrote about the game in his leaks.
We also have what appears to be an unconfirmed Dead or Alive 7 logo that sprouted from an anonymous account on 4chan. The Internet has been enjoying this one.
If there's not a doa6 update or sequel in the works I'm not tripping tbh, doa6 and LR are still there and I'm still modding it and others are too so it's not a total let down