According to the show, these four teams will remain together for the first four weeks of the season. That's not a terrible time frame, especially given the fact that one team could be targeted for all four weeks, ending with the entire team eliminated or, at the very least, shaved down to just a couple of players.

If the teams were to remain together any longer than four weeks, it could mean other teams getting progressively smaller and it just wouldn't work. So the four-week time limit makes sense. However, don't expect these teams to remain cohesive units throughout the season, let alone those four weeks.

As with other seasons of Big Brother wherein teams were made early on, there will likely be some cross team contamination in the form of secret alliances among people who aren't officially teamed up.