Right here are my reasons for thinking it will be two teams of 8:
1. VOG (a reliable insider) said that this year the entire series would focus on competition
2. The shattered eye, with the red dagger, suggestive of possibly backstabbing etc that would result from game play.
3. The many rumours of 16 housemates, that many housemates have never entered on a launch night.
4. The rumours of there been two separate bedrooms from a fairly reliable member on Digital Spy. Also there are no double beds, which kind of supports the two bedroom rumour, because fitting 16 single beds in one room would be tough.
5. The rumour of a War and Order theme.
6. Davina saying that this year will be tough for the housemates and also Phil Edgar-Jones stating that Big Brother is a 'Game Show'
7. These house pictures with only 8 seats around the table. (Yeah last year the house picture had one seat short, but that was one seat that could easily be added...this is 8 missing seats)
I think this will be awesome if BB9 is going to have this battle theme. It will be like Survivor but inside a house.