While Superstar Rajinikanth awaits the release of his film ‘Kaala’, our sources reveal that the actor is likely to head to the US yet again for a medical check-up. Superstar will stay put for about two weeks at the US and is likely to return for the audio launch of Kaala in the second week of May.The actor had previously announced his entry into politics, he is likely to reveal his party name and agenda later this year. Also, Superstar is likely to kick-start shooting for his next with Karthik Subbaraj for an upcoming Tamil film, which will be produced by Sun Pictures.