There's a formula to the BNA nominations:
One Country Act (Jennette McCrudy??)
One British/Irish Act (La Roux, Taio Cruz, The Script possibly Cheyl Tweedy or Pixie Lott

)
One RnB Act (Justin Beiber, Janelle Monae, Shontelle)
Two Other(s)- (Ke$ha, B.o.B., Big Time Rush

, Nicki Minaj)
They don't have to be these nominees but this is how it normally works.
The British/Irish win more than likely win with the Country act, then Others after.