From the web I saw that super sentai gokaigers in america will be called power rangers super megaforce. Also the Legendary War consists of other power rangers before Mighty Morphin how are they going to explain that to the people who don't know super sentai?
It is officially confirmed that Gokaiger is Super Megaforce. It is also confirmed that the ones before Mighty Morphin will not be in the Legend War. The reason why we see them is because of the lack of editing.
They'd better not call the Gokaigers Super Megaforce! They have nothing to so with Megaforce. In fact, they're not even from Earth or familiar with the super sentai/power rangers! I'd be okay with Pirate Force or Mega Pirates, but please not Super Megaforce!
From what I have heard from insiders that work with Toei (The company that produces Super Sentai shows) Just like they did for MMPR for it's second and third seasons with footage called Zyuranger 2. They have re shot the Legend War footage to coincide with Megaforce. So any season previous to MMPR will not be in the re shot footage.