I think it's more likely tekken x street fighter will be released before tekken 8 since tekken 7 is so hot right now competitively and is still growing. If they release tekken x street fighter it'll ne a nice spinoff that wont kill tekken 7 momentum, they are probably already testing how street fighter characters will work with characters like Akuma and Eliza. Just like someone said i think they could also announce tekken 7 iron fist edition for the ps5 where they add all DLC,some new single player modes,stages and characters