User blog comment:Commdor/E3 Coverage of ME3 News Begins/@comment-76.27.50.26-20110607020050/@comment-1221773-20110607234522

BioWare's official line on the Prothean blurb is that it was a mistake: http://social.bioware.com/forum/1/topic/323/index/7551111&lf=8