...because the people up are flipped (hence alternative timeline) and fast forward to the 3th,4th,5th,6th person to be evicted.

This actually fits within the theme. It is called timebomb.

I wouldn't be actually surprised if we remind on the "actual" timeline and get 4 old housemates from past series.

You have to think of "Back to the Future" films and Marty would be proud! Ha.

Also as I remember from those films, as we are going through the alternative timeline means the events in the BB would of changed (hence the series will not be the same as the original timeline).

It sounds more like 'Lost' to me! We'll be having flash-sideways next!

I've got a feeling later in the series they will "rewind" time.