I'm not concentrating on who they'll be, but what effect they'll have on the house, if they'll have any contact with the others, and generally what their introduction will lead to.
Here's my theory: The new family (most likely the Goodys) will have to select a celebrity, as we've already been told. I think that after their 3 days of living together, the original celebrity will have to choose only one of the family to bring into the main house.
What d'ya think to that theory, and do you have any of your own?
(P.s. - This might backfire, as I've just thought we'll probs be told on one of tonights shows! Oh well...

!)