The new Disney canon includes Star Wars: The Clone Wars TV series, but are The Lost Missions (e.g. the unfinished season 6 of Star Wars: The Clone Wars) considered a full part of the Star Wars canon?
I see absolutely no reason to think that they aren't 100% canonical. They were written and produced by the cast and crew of the other 'Star Wars : The Clone Wars' episodes, received an official release (on DVD, online and on TV) and each episode has a title listing on the starwars.com website.
Exclusive Licensing Agreement with The Disney/ABC Television Group Brings Star Wars Content to Netflix Streaming Members for the First Time
The Galactic Republic, Disney/ABC Television Group, Lucasfilm, and Netflix Inc. today announced the highly anticipated debut of the sixth and final season of the Emmy(r) Award-winning series Star Wars: The Clone Wars exclusively to Netflix members in the US and Canada on Friday, March 7. Accompanying the 13-episode new season dubbed “The Lost Missions” will be the entire Star Wars: The Clone Wars saga, which includes several director’s cut episodes never seen on TV as well as the feature film. This multi-year agreement also makes Netflix the exclusive subscription service for the entire Star Wars: The Clone Wars series.
These episodes (along with the comic series Sons of Dathomir) are considered to be a full part of the Star Wars/Disney canon.