Blue Rodeo is playing the folk fest this year. They're there almoste every other year so it's nothing special, but they always put on a good show.
The band I'm most looking forward to seeing at the folk fest this year is Michael Franti and Spearhead. They played the festival in 2005 and blew me away. Then about a year ago I saw Michael Franti give an accousic concert and question and answer session to promote his documentary " I know I'm not Alone". Here's a couple video's, a live performance featuring 2 songs, and an interview.