Now who??

I do need to r reach the episode better. But at the end they showed some new guy? Who is he and how will he be connected to all the characters? I felt he recognized DD or something. Will the assumption of someone coming back from Roshni's childhood come true? I'm sure if he is entering for a long period than one or two episodes then heis bound to become negative. I hope we get a jealous and possessive Sid.