I am not crazy about it - I think the returning players will play completely differently and be MUCH more aware of the cameras.  Not a good thing for those of us watching.Part of an article (complete article here).

“Like in previous seasons, the show will feature a group of people living sequestered in a fabricated house together, competing for a $500,000 prize. However, this time contestants will be familiar and popular faces from the shows first six seasons. One new aspect is that the audience will help decide who will be participating in the show: From a pool of 20 former cast members, 12-14 will be selected to actually enter the house, based on votes from the audience.”