I bet Alberto had a draft of "the good mock" saved on his computer; modifying it, tweaking it after every mock he posted here, making it perfect, ready-to-go for whenever bonnaroo.com updated their new theme.
When was the last time Bonnaroo even released their lineup on a poster? Last year they just did it on the website at noon on febuary 15th. In 2010, they were doing a band every 5 minutes or whatever.
They don't release the lineup on a poster but they always do have poster advertisements each year, for magazines and things like that. One could always claim that it's this year's poster advertisement.
I was sold on it at first, but I'm now firmly in the "fake" camp. While it's impressive, all you would need to do is have an adjusted for the rumors mock lineup ready to go. The two images used in the poster come straight from the website. There is a misspelled band on the poster and a few inconsistencies with the bold/not bold font.
Plus, aside from Paul Simon performing Graceland, there isn't really anything on the lineup that people haven't been guessing. Bonnaroo always has a few tricks up their sleeves when it comes to a lineup.