I have had to rewatch this trailer to figure out who this documentary is really about. Michael Waltrip? Dale Earnhardt? My conclusion is both. And now that I read the "About The Film" at https://www.blinkofaneyefilm.com/ I see that it is about the relationship between the two. Waltrip, the losingest driver in racing and Earnhardt, the most iconic driver in NASCAR history who lost his life seconds before Waltrip broke his 462-race losing streak.
So it appears this thing is going to hit theaters in the first half of September. My favorite comment on YouTube about this trailer was, "Oh, you want a theater full of grown men crying..."