I have a sneaky suspicion since watching K:SI that since Kong is a antagonist and along with G14 sharing the same characteristic they will somehow meet up, fight, then some new protagonist will show up, force the 2 kings to unite for the first time in like 55 years and beat the new MUTO out and then they go out for tacos to celebrate the union. I know the taco thing seems a bit far fetched but you never know.
that's the new trend of movies that pit two popular icons against each other seem to be heading. They might team up or its a tie in the end. So far every movie featuring this kind of match up tends to lean against except one movie, the original King Kong Vs. Godzilla(1962) movie where in the end you at least see King Kong swimming away, revealing that Godzilla was at the least vested by Kong.
I hope they at least show a clear victor of one battle between them. We all have been waiting for this kind of rematch for a very long time.