Julie Chen announced on The Talk that the twists are:
2 HOH's every week, each noms 2 housegests (4 total on the block)
There is a new competition called Battle of the Block so not even the HOH's are safe
Viewers will be interactively involved in this season as Team America
that #BB15 would be a "no floater" season, but the only people evicted so far were David (evicted for being a strong competitor) and Nick (evicted for having a strong social game and having an alliance).
