#1) There's already a thread like this one:
Here
#2) I believe either
Rexxar or
Grom. Why? Because they're unexpected - and cool - and loveable characters. :3
Blizzard did state that it would be the least predictable character we could think of, and the characters in the poll are predictable/easy to hope for.
Why not
Vol'jin? Because its already been stated numerous times that trolls can't lead the orcs.
Gamon, a tauren, is very unpredictable, but also unlikely since there's already one "King Tauren". The orcs are too bloodthirsty for a piece of raw-steak to lead them (not meaning to be offensive to any
Gamon fans of course, I like him too :3).
Grom is dead, it's very unpredictable that he comes back to life.
Rexxar is just plain awesome, he's disappeared for a while - just long enough for many people to not expect him (WC3 lovers, unite!), is a loved character, and he has the blood of an orc/ogre so he can most definitely rule over Orgrimmar.