I don't have a specific link, but it's been in about every casting/production update I've read and quoted from Paramount, Abrams, the cast, production staff members, and industry insiders. The one I'm thinking about specifically was an interview a month or so ago with either Abrams himself, or one of the writers, that they specifically stated they're not following the original continuity.
Going into full-on geek mode:
The concept of "When Kirk met Spock" AND setting the whole thing in Starfleet Academy by ITSELF kills continuity (Spock was on the Enterprise with Pike already). Also some of the main characters--ALL of which have been cast--would either not have been there or would be too young. Even if they DON'T take that approach, there's other problems.
A LOT about their casting decisions I don't see working. Using Captain Pike GREATLY limits the time setting and makes casting Checkov a problem because he'd be WAY too young at that time if they followed continuity (besides, he was basically right out of Starfleet Academy when he first appeared in TOS).
Honestly, if they wanted to do a prequel they should have stuck with either the original Romulan War concept. Actually, I thought it would be more interesting had they done something focusing on Bob April's command of the Enterprise since he's been alluded to in the media but never shown.
But until Paramount does a Sulu on the Excelsior movie like the fans have been screaming for for YEARS I've lost all faith in their ability to do ANYTHING worthwhile with the franchise again.