Usually they had 8-10 perfomances at the VMAS they already conformed 7 perfomances (Katy, Gaga, Kanye, Robin, Justin Timberlake, Macklemore & Bruno Mars) there are only 2 or 3 perfomances left there are big rumours that Daft Punk would perfom also artist ike Taylor, Imagine Dragons or comeback perfomances like Eminem could happen.
I honestly dont thik she would perfom

Ariana Grande and Austin would perfom at the Pre-show