Well, if SCD follows the usual format , then there will only be 7 male celebs next year and they will only need 7 female Pros, so they have that total already with Joanne.
Having said that, I suppose they will take on an 8th female Pro to make up the numbers in the Pro dances.....but it would seem unfair to Joanne if she is left as the spare again, surely the new person should be the extra one next year.