And their antics will be aired on the season premiere at 8 p.m. Wednesday on CBS.
But what about the contestants that havenotbeen revealed?
And one eagle-eyed viewer caught a recent Canadian promo for the show that teased Who are the mystery guests?

Credit: Sonja Flemming//CBS
while showing four generic silhouetted frames with oversized question marks.
I didnt know about it, Grodner said of the promo.
At this point, 12 people will be moving in for sure.
Note: Season 3 also had 12 contestants.]
So its been a long time, so chances are there will be more people.
The question is, who will they be?
You will find out tomorrow night during the first night premiere.
Sort of a coincidence that they ended up applying and being part of the same season, says Grodner.
And theyre both siblings of some very memorable and good players.
It will be interesting to see if they can be as good or better than their brother or sister.
So thats where we were a couple of years ago and we still stand by that.
Well show it when it is part of the story that were telling in the broadcast.
As for new twists, Grodner hints to keep your eye on the house… as in theactualhouse.
We have the craziest summer vacation ever, and the house has that theme.
The rooms are different cities and destinations.
There are phone booths and phones of course not to call out, but to call each other.
At some point it could be revealed that these will play into another twist.
All of this is intertwined, and more so than we have in the past.
But what about aBig Brotherfavorite that has been absent from recent years Pandoras Box?
We were doing that for a while and we always like to mix things up.
You may see it again or you say see it in a different way.
Ill tease that we might have another use for that room that we use for Pandoras Box this summer.
You know what they say: expect the unexpected.