User blog comment:Master Sima Yi/Assassinews 19-03-'14 – Two Assassin's Creeds for 2014?: Unity and Comet/@comment-5219323-20140612020751/@comment-4254431-20140612155946

It's 'Murican by the way. Plus, it's not an accent it's the CORRECT way to speak!

As for the British accent I'm pretty sure it's the final product. The reason being is they would not pay a voice actor,who they had to take the time find, to just voice for the demo or early production just to scrap him. Also, it was to my understanding that they changed Edward's voice during the audition process what we heard at E3 was what was on the final game.