Also i thought i had a better experience on RTW when Factions spoke english, i know the foreign language adds to the theme but all factions are the same which would not have been true, so may as well be in english

Pardon? I don't understand this question/statement

Also will the campaign have more of an advanced AI movement? where the AI acts also more accurate to history?

AI in the TW series is hard-coded, and the EB team can do nothing about it. They will act as stupid as they do in the vanilla game. However, EB uses the Kingdoms expansion, which features better AI.