I honestly think if they wanted Jane Pauley, they would've done that awhile back (I recall her doing the evening news for a day or two after Scott Pelly left the show).
Deborah Norville is possible. Mary Calvi I've always seen as a potential replacement for Deborah, wether or wether or not that would happen.
However, I think CBS is eyeing a younger face I've noticed lately. Which could play in how they're picking.
I honestly think they're eyeing Tony Dokoupil as a replacement for her. Personally, I'd like to see either Tony or Anthony Mason as anchor.
If they put Tony on the show, they have endless opportunities as to who can replace him on Mornings'.