Christa Faust is writing 3 Fringe prequel novels.
http://faustfatale.livejournal.com/275639.html
According to the author the novels will be considered canon:
I've been waiting for some tie in novels since the show began so this is exciting.
Looks like the first one comes out April 24th: http://www.barnesandnoble.com/w/fringe-christa-faust/1114032907
http://faustfatale.livejournal.com/275639.html
I’ve been hired to write three prequels, each centered around one of the three main characters. The first, called THE ZODIAC PARADOX, features Walter, the scientist, along with William Bell and Nina Sharp in 1974. The second THE BURNING MAN, features Olivia, the FBI agent, as a teenager in 1995. (This is the book I’m working on right now.) The third and still untitled book will feature Peter, the scientist’s son, during his shady, gray-market dealings in 2008, just before the start of the first season.
According to the author the novels will be considered canon:
I have been working closely with Bad Robot every step of the way, since these are officially sanctioned tie-ins and, once published, will be considered canon. Of course, there's always room for nit-picking no matter how careful we are, but I did my best to stay true to the spirit of the show and I hope fans will enjoy reading the books as much as I have enjoyed writing them.
Also FYI, because these books are set before the start of the first season, they are based on the original timeline and not the later, altered timeline.
I've been waiting for some tie in novels since the show began so this is exciting.

Looks like the first one comes out April 24th: http://www.barnesandnoble.com/w/fringe-christa-faust/1114032907
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