According to Ubisoft their main goal with Assassin’s Creed Unity is to expand the word you travel through. Combat appears unchanged, movement it likewise with the exception of being able to climb diagonally and also climb down (a welcome addition). What has been changed is the world and how you view it. If the information from Ubisoft is to be believed then the new world will be around 33% larger and should be a 1:1 scale.
But don’t take our word for it, you can always check out the videos that Ubisoft has put out.
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