After Salman Khan ? Sonam Kapoor?s Prem Ratan Dhan Payo releases, we hear filmmaker Sooraj Barjatya is already thinking of his next. If sources are to be believed, Barjatya is all set to start working on the sequel of his 1994 super hit ? Hum Aapke Hai Koun starring Salman Khan and Madhuri Dixit-Nene. We were surprised when we came to know about this sequel.