The most valuable part, really, is the interview with community duder and all-around Street Fighter badass Seth Killian, after whom the game's last boss is named. (Yeah, really.) Seth gets into serious depth on the creation and use of focus attacks, the importance of canceling moves, and a bunch of other high-level topics. If you're looking to step up your game--and judging by the low number of people I've been seeing online who are even using things like focus at all, there may be a lot of you--this might be a good place to start.
Plus, it's just a neat and generous gesture from Capcom, whose community effort seems to be all about that lately. Hooray!