But the site is still being updated until the end of March. No winner can be declared until the site finally stops updating which is still several weeks away. There's still a huge amount of points to be won in the next few weeks.
Not to mention what about the people living in Europe? They wont get the game for a long time, so it'd be unfair to end the contest only because it's being released in America. If we go by when it's released, then we should have ended it at the end of January since that's when it was released in Japan first.
So until all the characters and stages are revealed and Sakurai post a message that says he's done with updating the site, I'm going to keep on predicting.
Stage Update: Electroplankton Stage
Super Specific: Complete Event #28