3rd DLC is called Birth of the Legend

Here's my thoughts.

I really doubt it's going to be another promotion with that name. The current Fighting Road was called NJPW Heavyweight 2017 (or in game it's called something like NJPW Battle For The Heavyweight Title 2017), the other scenario is called NJPW Junior Heavyweight 2017 so the fact that this one is just called Birth Of The Legend seems like it will be an original scenario that expands on the main story. Your wrestler going from IWGP champion to being a legend.

As to licensing legendary Japanese wrestlers, maybe? I really doubt it would be a ton of them like KOC but if they licensed 10 or 15 freelance guys to sprinkle through the scenario, that wouldn't be that crazy. Since Fire Pro isn't a NJPW product, I doubt they have any say on who Spike can add to the game. That said, Spike probably wouldn't want to step on any toes by adding somebody that the NJPW office has bad blood with.

Whatever Spike does, I hope that they continue adding more match types to the game and not just edit parts/moves. It'd be really nice if we could get an official Battle Royale or 2 out of 3 falls or Iron Man or any of the other basic match types that modders added in.