I personally doubt it unless they announce the pc version soon.
Cross platform fight can't be simple added later, they need to do it while actively developing the PS4/PC version (I exclude X1 because MS is more strict and currently only really allows it rarely in their own games).
Which is kinda sad, SF V and Rocket League paved the way for PC PS4 cross-platform gaming and fighting games communities should be united as much as possible.
SF V and Killer Instinct (PC) launch soon, two big fighting games and both crossplay with pc.
Hopefully Tekken project decides to do the same, it's more work but definitely worth it.