After decades of will he and won't he, superstar Rajinikanth sprung a surprise on fans and political observers by announcing his decision to take the plunge into Tamil Nadu politics. He promised "a wonder and miracle" in the polls. He tweeted with hashtags 'It's now or never' and 'We will change, we will change everything'. The expectations are immense. What does this mean for political equations in the state five months ahead of the elections?