They are trying to say Barrymore or Chantelle Houghton might go in. I doubt it - the producers usually have a rule that they don't touch past Big Brother contestants, and stay away from most other reality TV type people. Perhaps they're breaking that now, maybe because the celebs know reality TV is on the way out, the stigma of the last Celeb BB or maybe the budget is low this time - but usually ITV throws cash at this so i doubt it's true, unless they have someone really A-list secured who is going in for big money.
IMO, there is a whole load of untapped talent they can persuade to go on without touching past reality people. Surely if you chuck enough money at the big names they'll do it.