I am sure among all the names that have been mentioned HC and Shabbir have the maximum chances because this seems like a young love story and also these two have more fan following on the channel. Both Prem and Milind/Rishi have immense fan following which I am sure EK and the channel know. From what I have read Shabbir was approached for Keshav Pandit and Ek was very keen too but they couldnt agree on a deal and Zee TV was keen on Sarwar Ahuja (he plays the role of Jyoti's ex husband on Imagine's Jyoti and he was also the finalist of Zee's Cine Star ki khoj along with Archana from PR) and so finally Sarwar is doing Keshav Pandit. Hiten and Sandeep playing young lovers after being fathers to grown up kids I dont think will work. It would have been ok if it was a mature love story. From the looks of it this seems like a young love story like KDM, Kayamath and the likes. Dont know about vikas sethi. I am sure watever the outcome is it will be good for everybody involved or not involved.