New heroes, Battleground and Arena mode announced for Heroes of the Storm

Three new heroes for Heroes of the Storm were announced at BlizzCon 2015 today, along with an Arena mode and Towers of Doom which is an all-new Battleground. The new characters are: Lunara the dryads ranged assassin, Grey Mane a Worgen warrior, and the two-headed Cho'Gall who is both a warrior and an assassin, respectively