It sucks we won't get the HDD predics I dunno, I'm totally off with Demi and the other girl
My advice would be to look on wikipedia for previous album's opening sales and to realize if the relevancy of the artist went up or down.
Eve's last album came out 11 years ago though.
Lady Antebellum (Capitol Nashville) 140-160k
The Great Gatsby (Interscope) 90-95k
Now 46 (Capitol) 80-85k
Pistol Annies (RCA Nashville) 75-80k
Rod Stewart (Capitol) 40-45k
She & Him (Merge) 20-25k
Music of Nashville, Vol. 2 (Big Machine) 17-20k
Natalie Maines (Columbia) 17-20k