User blog comment:Kaloneous/Mass Effect 3 Ending DLC Denied and PAX/@comment-4933332-20120411163118

I mention before that the extended cut mandate of not changing the ending but adding extra cutscenes could create a more varied ending taking in consideration all your choices throughout the series

well it seems like this is now officially confirm that they will produce more varied ending. http://www.eurogamer.net/articles/2012-04-11-mass-effect-3-extended-cut-adds-player-personalisation-to-endings