New Arenas
I'm thinking that each group of characters from Runeterra could have an arena. A watery-piratey Map in Bilgewater and just for kicks put in a pirates-vs-ninjas mini quest. A Ionian arena in a temple featuring 2 V 2? Underground Noxian fight club where Summoners can bet IP and even RP?
Maybe I'm crazy I'd just like to see some more variation in the maps. I get tired of seeing too much Summoner's Rift.