Deepak does seem like the fixed winner this season, but I wonder if Bigg Boss is so shameless to again make a fake gaon ka chora win. It'll be so predictable. Jasleen is a worthy opponent, and she might be in Top 2 opposite Deepak, but not high chances of her winning because she's not an Indian. There can be also be a wild-card entry in top 2, so nothing can be said as for now.
Deepika is a strong contestant, and I think she'll be in finals, but not top 2. Her trying to be Mary Sue, and not showing her true character will go against her. Sreesanth has potential but he doesn't seem to be a lambi race ka ghoda. I think he'll reach the saturation point at the middle of the season.
As for now, I think it'll be Deepak vs Jasleen in top 2, unless a strong wild-card comes. Also if you see the pattern, in 10th season, it was celebrity vs commoner. In 11th season it was celebrity vs celebrity, so I think in this season they'll go for commoner vs commoner in top 2.
The chances of a Wild-card winning Bigg Boss is almost neglible. When Imam, who is considered as the best contestant in Bigg Boss history by many, didn't win, then I don't think anyone else can. But you never know, there is always a first time.