300 used the words Sparta, Thermopylae, Persia, Leonidas , Xerxes and the number 300.
Apart from those words/ names being used it had nothing whatsoever to do with the history of that event. Even the geography of the pass was wrong. the military strategy was wrong, the characters were wrong, the religions were wrong, the cultural information was wrong.
There was so much screamingly wrong it was difficult to watch until I switched off any idea that this was Spartans, or Greece, or Persians. I thought Conan the Barbarian and then it was fine.
As a fantasy film under different names 300 would have been fantastic.
As a historical drama it was a pathetic schoolboy mess.
Presumably this one will be similar. So just don't expect it to be anything to do with history, lie back and enjoy a completely unconnected fantasy.