Is the original CW series? The animated portion of the Xmas special?
I have a thread here where I maintain a list of what Lucasfilm considers canon. I consistently update it when new projects are announced.
Basically, it includes everything after the Disney sale:
Star Wars Rebels, the new movies starting with
The Force Awakens, Marvel's upcoming comic series, and Del Rey's novels starting with A New Dawn.
From the pre-Disney days, it includes the six live-action saga films,
The Clone Wars animated movie and TV series (2008-2014), and the projects that resulted from scripted but unfinished episodes of
The Clone Wars.
I'm about halfway through
Tarkin, and Luceno, as always, heavily references the EU. Since
Tarkin is canon, that means the events that are mentioned within are also canon, whether or not the books, comics, games, or shows that depicted them are the exact canon way that these events transpired. For instance, Admiral Screed has a role in the book, and he was from the
Droids series. This means that the character is now canon, but his appearance in that animated series might not be. Some of that series has already been contradicted by
Rebels, such as the fact that the Rebel Alliance proper didn't exist for very long before ANH. But despite what many fans felt at the time of Lucasfilm's announcement, this is still very much the same universe as depicted in the EU, whether or not the specifics or events are the exact same.