I've just seen a completely epic trailer for some of the Clone Wars animated series. It looks like it fills in
how Darth Maul came back to try and take revenge on Obi-wan
I know this story from research, but it piqued my interest as I had assumed that the show was mostly filler and didn't contribute a significant amount to the Expanded Universe for Star Wars, not did I think it related much to star wars canon of any level. Is that so?
As well as this, the publication of this raises Maul's story from C-Canon to T-canon. Is there new content from this show that effects the Canonicity of other aspects of the EU?