A new official promotional video asks that question, and awaits your answer. As well as your drool, since this is a really nice one.
There are short introductions to all of the characters (with a bit of new gameplay footage), and then a nice tour of the world, showing new dungeons and scenes from within Act Two town Caldeum. They also cover skill runes, equipment, PvP (*not available at launch), multiplayer, and more. The last bit even shows the Siegebreaker in some Hellish environment, as he asks politely if the Barbarian could assist him with a bit of food stuck between his teeth. (Didn’t Fatalities they remove fatalities, though?)
Thanks to WDC for the tip.