User blog comment:Zaphoney/ME4 Ideas ?/@comment-4740958-20121025224403/@comment-5607780-20121027235113

Well, I think there could potentially be even more than 3 possible endings since the morality of Shepard could perhaps also effect how things go. For instance, if a renegade Shepard takes control of the reapers, then it would make sense if his/her personality resulted in him/her becoming corrupted by the power, whereas if he/she this wouldn't happen.

Also in the extended cut, you can choose not to accept either option and allow the cycle to continue. Though I guess they could just ignore this.