I think we'll see more kruleboyz like the monster killers in Warcry which will fill the slot of bonesplitters.
Bonesplitters are monster hunters who wear very little and use bone as decoration, the Warcry monster killers tick all those boxes.
I can see them as a bridge between Ironjawz and kruleboyz.
Beasts I can see getting the AoS treatment, I'll love to see what GW do with modern tech and sculpting, giving us some truly terrifying nightmare creatures.