Gauhar Khan may be the one of the Housemate in the Big Boss House in Season 4.  Some of the sources had confirmed this news that Gauhar Khan is asked to be the one of the housemate in the show. She is the well known model come actress in Bollywood. 

Dimpy Ganguly is accepted to be the house mate in Big Boss Season 4, right now this is not officially announced but from some few sources this is confirmed.  Dimpy is the second wife of Rahul Mahajan, who get recently married in the TV serial (Rahul Dhulaniya Le Jaega). 
Dimpy was in the news for her bikini photographs.

Shiney Ahuja is the one of the contestant or you can say as a house mate in the Big Boss Season 4.  This new is not officially accounced but this is coming from some sources.
Shiney is known face in Bollywood and now he is a rape accused.  According to the people involved in the selection commity they want to give a change to Shiney to change his image through the show which was affected by Rape charges