1) Tara is going to find out that Rudra killed Rahul and there will be issues there and i think he might go to jail.
2) Sundari, I think Kajal is trying to kill her to get revenge for her mums death and her (Kajal's) being blind i think she might be faking it.
3) As for Dhruv/Karan, i think Karan out of helpness will have to stay longer than 26hrs and its possible that another character will come back and play the role of Dhruv with a face change etc, by then i think Karan will have become part of the family in Dhruvs place ie he'll take Dhruvs place and may fall in love with Vedika.
Shaheen