User blog comment:Master Sima Yi/Assassinews 08-02-'13 — Next game will be all new, plus DLC promotional material/@comment-24.199.83.66-20130212102435/@comment-3046679-20130212121835

Because they ran out of filler. Doesn't help that AC3's historical setting wasn't that exciting to begin with - we just jumped from one semi-major event to a battle, to another battle and on and on.

Would have been much better if they opted for AC1 approach to a war torn land - work away from the battlefields, not in the midst of them.