No one big, which is not unusual for a genre film I guess.
The Blizzcon panel convinced me that this movie has the right people behind it. Turning that talent into a great movie is another task entirely but it is not a Hollywood cash-in.
Duncan Jones is a great director who understands the universe. The VFX Director is very familiar with WoW. Blizzard is heavily involved with Chris Metzen overseeing story and the Blizzard cinematic department handling concept art. I am not sure what a great Warcraft movie is but these guys think they've figured it out.
You say that as if Chris Metzen being involved in story these days is a good thing.
Thinking about HOTS still gives me nightmares.