http://idwpublishing.com/phpBB2/viewtopic.php?p=64871&sid=1af2d160ecbdd4dcd4e8a398dcf7a29e#64871 April 9 Focus on Decepticons Best of the UK: Space Pirates #2 April 23 Spotlight: Grimlock April 30 Reign of Starscream #1
Ryall mentioned in the link above that "it ran late". Furman had his script ready for awhile now, so I'm guessing we were waiting on art or approval. It was indeed supposed to be March. IDW even had one-page advertisements in their recent comics advertising two Spotlights in March.