A long time ago, EMC had arenas. However, they never made it out of beta. There's been a lot of talk about how EMC is getting "boring". Lots of people have been calling to bring this back-a fun way to spend time with your EMC friends. I'd personally like to see the staff's opinion on this idea.
I haven't been playing long enough back when EMC had arenas but I once got a link to it from ICC. The whole basis and maps and whole arena for rupees and rewards felt fun and it looked interesting with new maps and all. I think they should add them but we'll have to wait and see
I think it would be interesting if a betting system was implemented. Also PvP battle arenas would be nice.