User blog comment:JakePT/ME3 Info Blitz Begins in April/@comment-1691295-20110405065709

And continues in May evidently!

Official Xbox Magazine has promised info in their next issue on May 9. At this rate there won't be a magazine on the stands without ME3 on the cover this time next month.

http://www.computerandvideogames.com/296701/news/imminent-mass-effect-3-reveal-backed-up/