I for one can't wait to play this, I've been playing DOTA 2 for a while now, and it's getting a little stale. Anyone who plays a MOBA will agree the best part about playing these games are the team fights, and this is all this game is. They made the game seem super simple but in a way Blizzard pulls off, meaning it looks simple but has depth if you want it, just like Hearthstone. No laning phase, not items, just straight action all the time, the characters level up each have their abilities that then branch into other abilities that you have to choose from some can lower cooldowns, grant magic immunity of a couple seconds etc. These branching abilities take the place of items.
A lot of people are a little unhappy because they wanted a traditional MOBA from Blizzard. However, for those people there are already DOTA, League and a ton of other games just copying each other. This is a MOBA but it's different in a great way, the objectives cause people to gather around areas creating large 5 v 5 team fight quite regularly and I believe each map is different with unique objectives and maybe even different layouts. I haven't seen a video posted of the gameplay here yet so here is a long one.
With Hearthstone and this Blizzard shows they can make new and exciting IP's, and it gives me hope that their new RPG will not just be an updated WOW but something new. If that's the case maybe it'll be the first online RPG I play.