FourFiveSeconds is definitely NOT representing what R8 will sound like in general. There is no way she scrapped those tracks she made with Mike Will Made It, DJ Mustard, Big Sean, Darkchild, Nic Nac, The Dream, Sia etc etc et .
I mean, there's "Pour It Up", "Get It Over With" & "What Now" featured on the same album. We can already tell that R8 will feature many different genres again.