I've been playing for a few hours now. It's pretty spectacular so far.
For those of you afraid of it being another ACII expansion, like Brotherhood and Revelations were, it's not. It honestly feels like a new game this time around.
It's also gotten stellar reviews, if that matters to anyone. Even though I've heard rumors about the ending that I really don't like, I have faith that I won't be entirely let down.
It really feels so odd...and at the same time, a breath of fresh air...to be playing in a setting where there's no really tall structures to climb all the way up and jump off of.