Now that the movie is out ... (At least in Japan?)
Don't watch it. It's terrible. Now for spoilers of everything they changed.
Spoiler (mouse over to view)
So many things were changed ...
Even if you do turn a blind eye to everyone in the cast being Asian, when Mikasa is suppose to be the last known person that half Asian. They still changed too much, and not even in a good way.
There was no Survey Corps at first. They formed after the attack on the wall.
Mikasa was very innocent and cute/nice at the beginning which only leads me to believe that they completely nixed her background story of how her parents were murdered and how she killed one of them.
This wasn't mentioned until (about) an hour in that Eren lost his parents when he was young. Yeah, they made him an orphan. That scene where Eren sees his mother get killed then eaten by that creepy titan never happened.
INSTEAD, Mikasa is in the situation with that creepy titan. For more than half the movie we believe that she got eaten. Not only did they not show how she escaped. Mikasa tells Eren how she was eaten and shows him a scar she has ... which the placement of it and how she survived a bite makes no sense.
Going back to Eren's mom not dying the way she was suppose to, the main reason why Eren hates the titans. Why he wants to kill them all. Gone, instead the only reason why he hates them is because they trapped humans inside the walls and he wants to go out and explore. Which Eren's desire to go outside the walls was always there it wasn't his sole reason to fight.
They changed Levi's name and made him have some sort of relationship with Mikasa. (Probably sexual with the way he was touching her ...)
The Armored Titan never appeared only the Colossus Titan and Eren taking titan form.
Annie, Reiner & Bertolt weren't shown .... unless Shikishima was suppose to be Reiner ...
Jean seemed drunk every time you saw him.
Sasha's character was not funny at all. Don't get me started on Zoë Hange's character ...
They had cars!!! My god I saw them using cars instead of horses.
The time line is all messed up (age of Eren+)
The special effects ... there was brief moments when I thought oh that doesn't look bad, but most of the time it wasn't good.
Unless you want to ruin your feelings towards the manga/anime don't want the live action movie.
(I'm half asleep and probably have more typos than usual >.> I may reedit this just to fix that)
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. The director will surely make a horrible Godzilla reboot too as he proved that he can´t do action or scale (or even violence) ether. Even the new Death Note tv series is better and i gave it an identical IMDB score. The recent Parasyte is nonsense too and Patlabor looks like shit so just re-watch Kenshin or the first Old Boy again. 
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Cuz I can see that being a thing since they messed everything else up by the looks of it. @__@