User blog comment:JakePT/ME3 Info Blitz Begins in April/@comment-1221773-20110407195917

Game Informer confirms Mass Effect 3 will be their May 2011 cover story:

http://www.gameinformer.com/b/news/archive/2011/04/07/may2011_2d00_cover_2d00_reveled_2d00_me3_2d00_789055.aspx