I personally think that Nandini will obviosly go to Jail, but after that Karan, Tulsi, or Mohaan Singh will somehow find out that Nandini is infact innocent, and that she had attempted to kill Gujral, but it was actually someone else who had killed him, and this person is probably someone out of the Viranis family, possibly Shraddha, or some character that had troubled the Viranis from the past. And then Nandini will be released from Jail, and they will live a happy life, and then again, like always, a new problem will occur (that's normal) and this problem can be the mercy killing of Savita by Tulsi (can anyone explain to me what the heck that's supposed to mean?! Tulsi killing Savita?!)
I love this serial, but Ekta does need to be a bit more creative, and actually make sense on her scripts. I mean I understand Mihir said he was the killer to save Nandini, but how the heck did Gautam say he's the killer? That's just screwed up.