Like in Brawl, Sakurai will be providing daily updates of the development progress of Super Smash Bros for Wii U/3DS through Miiverse.
Today's update is a screenshot of Sonic's stage in Super Smash bros. We can see Mario and Sonic battling out. To celebrate the release of Sonic Lost World - Sakurai has teased details about Windy Hills. Unfortunately, he did not go any further.
Sakurai on Miiverse:
Pic of the day. Sonic: Lost World is out in Japan today! The Windy Hill area can also be seen in Super Smash Bros. for Wii U…but I can't tell you all the details yet!