User blog comment:Arbington/New ME4 Teaser Pics, Possible Upcoming Reveal/@comment-9753034-20131108173914/@comment-1786741-20131109033817

Well, an ANNOUNCEMENT trailer is what I should have said, they pretty much already confirmed that ME3 was in development after ME2. As for ME3's engine being more refined.... that's a tad arguable considering just how many resources they re-used with little to no touch up.