A couple more rumours:

Michael Le Vell (you could see him doing it and doing well on CBB after Davidson but doubt this one is true if he's returning to Corrie in a few weeks which I read somewhere else)
Nadia Forde (seems more likely)

I'd like to see Sam Fox 80s page 3 girl, Sinitta pop star and simon cowells ex, Rustie Lee cook and overall huge personality, Chris Fountain ex soap star axed from coranation street. Stephen and Chris or Steph and Dom from Gogglebox hilarious.
Joan Rivers would be very interesting as mentioned

Wasn't Evander Holyfield paid some ridiculous fee only to be evicted first?

Dear God another model that nobody has heard of. Celebrity don't make me laugh.

That sounds like a dreadful line-up