I think for sure #3, familiar but unused, is going to become a big thing.
I would love it if #5 came true! You just don't see girl names making the migration to boys very often. I think it could be really neat. I was watching an old movie the other day, and one of the male characters was named Holly, like it was no big deal. I thought it was fantastic. Formerly male names that have become female returning to use on boys would be fun. Vivian, Evelyn, Meredith, Garnet, stuff like that.