I'm surprised they got Nijem on a main card and not the under-card.
Well we don't know yet.
I assume (Anything else would be dumb) that these three fights are on the main card:
Bendo vs. Diaz
Shogun vs. Gustafsson
BJ vs. Rory
There's still one spot open, and one of the fights have to fill that spot
It hasn't been announced yet