At least I think that was the tiers.
Nope, it's far more idiotic and convoluted than that:
G-Canon (George Lucas Canon): The movies.
T-Canon (Television Canon): The Clone Wars (which always annoyed me because it arbitrarily went out of the way to contradict things from lower tiers for no good reason)
C-Canon (Comics Canon): Anything that isn't directly contradicted by the above tiers. Almost everything is in here.
S-Canon (Semi-Canon): Anything that IS contradicted by the above, but not completely.
N-Canon (Non-Canon): Self-explanatory.
And I really don't know why people are freaking out over the changes because Star Wars canon has always been fragile at best with Lucas being on record of hating most of it and going out of his way to arbitrarily contradict other stories with his preferred ideas. The completely pointless and inexplicable name change of Korriban to Moribund, anyone?