What do you think Valve will come up with for the storyline for Dota 2? Orcs, Humans and Scourge is out of the question since that is Blizzard IP. Looking at the concept art, it's definitely not in the Half Life or Team Fortress universe... something brand new?
I remember reading somewhere that Valve had started development on a fantasy game sometime back, which was never completed because they moved on to Left 4 Dead. Maybe they will be using the storyline from that for Dota 2?
Also, I'm looking forward to the hero introductions like in Team Fortress 2
Let the discussions begin!