The revelation about the Shining Knight doesn't surprise me, except that it is pleasant to see a little more diversity in the DCU. What also should not surprise me is the angry internet fan-troll response to the Newsarama article. "Blubber blubber why doesn't everyone look like Barry Allen in 1956 blubber blubber whine?"
Yes, it might well be a publicity stunt. But it is surprising how often publicity stunts actually helped effect necessary historical change.