Lore Based Global Events.

I'm probably not the first person to say the Bilgewater event was a success so after watching Necrit's Video I think he's onto something with a Mordekaiser's army besiging Noxus. This could also be used to tease the return of Katarina's father, or at least reveal what happened to him.

I also personally would like to see a Lokfar vs Rankor battle.