It was way less sad than I'd expected, and had a lot of interviews. Of the Star Trek cast, Chris Pine was most heavily featured, and got pretty emotional. Overall, I found it informative and captivating; and not too long. Emotionally, it feels like a great closer to "the grand summer of 2009" that I've dubbed the start of the reboot-era.
It is available on demand on places such as iTunes and Amazon in most of the world. I've embedded the trailer below.