Recently, to celebrate the 40th anniversary of the revelation that resulted in the Priesthood (and Temple) restriction, the Church held the "Be One" celebration:
"Be One" 40th Anniversary Celebration
Notwithstanding there being no official apology from the Church for the obvious racist origins of the restrictions, it was a good celebration (also, the idea of a black man portraying Joseph Smith? Awesome!)
For a book-length discussion of the history of blacks within "Mormonism," see:
Russell W. Stevenson, For the Cause of Righteousness: A Global History of Blacks and Mormonism, 1830-2013 (Salt Lake City: Greg Kofford Books, 2014)
Be sure to also check out the Gospel Topics essay, Race and the Priesthood
