is about to kick off — which means a whole new house theme for fans to enjoy and for the houseguests to navigate over the next three months.Ahead of the season 25 premiere, stalwart host Julie Chen Moonves invited ET for an exclusive tour of the house, so fans can get pumped up for the excitement to come.«The Multiverse is the theme for season 25,» Julie explained. «What does that mean? That means the game has turned upside down, anything can happen.