Its the first one with a third-person perspective ... ok there was LOCO which had 3rd peson view as first MOBA (Multiplayer Online Battle Arena) genre game ever, but it somehow never got popular, so lets try Smite!

http://news.mmosite.com/content/2011-08-31/dota_inspired_mmo_smite_debut_trailer_at_pax_prime_2011_1.shtml

official site: http://smitegame.com/