Goddamn political correctness bullshit. I didn't even know what there was a movie being made until I clicked this thread, and I can honestly say I'm not interested anyway, black Heimdall or not.
But PC has always pissed me off to no end.
What's next, a movie of the founding fathers of the US with one of them being played be a black dude and another by an indian? Can't go around offending people's delicate little feelings can we? Pfeh. Bullshit.
The big difference here (other than the fact that race doesn't actually factor in to the character of Heimdall at all, being a god or alien or whatever) is that Heimdall is a
fictional character (the Thor movie) based on a
fictional character (the Thor comic) based on a
mythical figure, that's three levels deep of "It's not real so who the fuck would care if they changed the character abit". The Asgardians in the Thor comics aren't even gods, really. Versus your stupid example of real historical figures.