About asian nominations, the first thing that came to mind is Sessue Hayakawa for The Bridge on the River Kwai (best supporting actor). That same year (1957) Miyoshi Umeki, a japanese actress who later became american, won for best supporting actresse in a movie called Sayonara (which also earned Red Buttons a best actor win). Also Pat Morita got nominated for best supporting actor for The Karate Kid. Mako got nominated for best supporting actor for The Sand Peebles in 1966. Ryuichi Sakamoto won for the score of The Last Emperor. More recently, Ken Watanabe got nominated for best supporting actor in The Last Samurai. Also closer to us, Rinko Kikuchi was nomined for best actress in 2006 for Babel...
As far as diversity go, 2015 was also an all caucasian affair with just Selma running for best picture and best song along with the usual mexicans (for Birdman). 2014 had 12 Years a Slave and another mexican for Gravity (and some asians in the technical awards for The Grandmaster). In 2014 you had Beasts of the Southern Wild, Denzel Washington in Flight and Ang Lee on the asian front who won best directing for Life of Pi...
So I guess the issue in 2016 is that some big stars (Will Smith, Samuel L. Jackson) did not get nominated and that the 'big black movies' of the year (Creed, Straight Out Of Compton) are barely on the radar. I am not it is a huge injustice, but I have not seen Concussion nor the NWA hagiography.