Assassins Creed IV Gameplay teaser trailer

I really don't want to play another assassins creed game but damn this looks sexy.  I guess i just need to go into it of the mindset that this is a sandbox adventure game and forget what AC1 and AC2 were because the game seems to have broken free of it's roots.

http://www.youtube.com/watch?v=Vb1j8S3tWc8