The Mighty Monkey of Mim wrote:
(John Cho and Linda Park aren't Japanese, either.)
The Sulu question was already addressed here; "Sulu" isn't a Japanese name and was taken from the Sulu Sea in a bid to give the character a Pan-Asian flavor.
Furthermore, we know Takei gave his personal blessing to the recasting after being approached by Abrams. In other words, changing the ethnicity of the actor wasn't taken lightly by the creative team. But that was then. This time around, things seem to have been a little more loosey-goosey.