No one cares about Katy vs Gaga outside music forums. Besides the fact that when they both performed at the VMAs they both increased well and it's not like Katy stole the show. Those are great November promo spots and she would be dumb to skip them.
100k it's almost impossible. She has already like 50k of digital preorders and lots of those people alone will buy the physical copy too cause they're stans.