The novelizations of the seven films–including The Clone Wars–are canon.
— StarWarsBooks (@DelReyStarWars) April 30, 2014
To clarify, movie novelizations are canon where they align with what is seen on screen in the 6 films and the Clone Wars animated movie.
— StarWarsBooks (@DelReyStarWars) April 30, 2014
At a Celebration, the people in charge of EU continuity said that those tweets were from people who didn’t know what they were talking about.