Here's an idea I would like for secret story seasons:
Have someone's secret be "I Know everyone's secret". They won't be allowed to reveal anyone's secret in any way, they just know everyone's secret. This would just create a lot of Saboteur type drama, paranoia, & conflict.
And yes, the twist is only as good as it's secrets, which are mostly pointless or could be too-revealing. So, I hope we never see this twist for the US series.