After reading and thoroughly enjoying the Newsflesh Series, I was pleased to discover this novella, along with "Countdown", added to the Newsflesh universe, acting as preludes and satisfying my curiosity about the Rising itself. That said, it doesn't matter when you read this, before or after, it stands alone as a well written and gripping story.
One of the strengths of the Newsflesh Series is the believably created scenario of a post zombie apocalypse world and characters you can care about. San Diego 2014 builds on this and I can't speak highly enough of the pathos generated for the characters throughout. It's well written enough to generate genuine tension as you read. It's not a huge read, but it grabs you immediately and stays with you afterwards. A thoroughly enjoyable tale.