[EddyEagal]

I think the secret is either regarding the prize fund or housemate status. I know it's been done before, but I could imagine the housemates having to work for their status, which would mean the secret would be that the housemates aren't actually housemates.

The second possible secret for me would be that their is no prize fund for the winner, and that housemates will have to work to increase the fund. This would definitely prompt game plays which could be interesting.

Just came up with these thoughts based on the constant suggestion of housemates having to work and the series being tough.