Eurogamer.net has word that BioWare has stated
Mass Effect 4 is to be expected somewhere from late 2014 to mid 2015, citing information in an article on
GamerSyndrome, ignoring the warning it begins with that states: "This posting has inaccuracies in it and we ask that you don’t quote from this article or the news found within this page until everything is sorted out." Going along with that, Eurogamer has both a confirmation and a denial from EA that the speaker in this case was Mike Gamble, who apparently also said the date is so vague because the game has only been in full development for a month or two.