User blog comment:J. Severe/E3 Nintendo Direct 6.11.2013 (7 AM PST/10 AM EST) - Official Hype Blog/@comment-26124383-20130601032555/@comment-1518158-20130604021247

The silhouette isn't hinting at Galaxy, it's just symbolizing a 3D Mario. I believe Nintendo's already said that they're done with the Galaxy games.