As expected Nintendo showed some footage of Sonic Lost World for both the 3DS and the Wii U during their special E3 2013 Nintendo Direct. Sonic Lost World was the last game shown in their third party developer lineup.
Sonic Lost World was shown for only a short amount of time, which is likely due to Sega showing the game off themselves later on in the expo.
Even so, I managed to snag a screenshot of the 3DS version. You can thank me later.