No, as stated in the twitter discussion thread and if I understood well, this week's episode was the last of the show.
Most likely no new stuff since 2014... at least nothing special (eg no vocal bgm) because I think that she would have tweeted about it or that it would have leaked somewhere.
At most we could get a compilation of the 3 soundtracks with some unreleased tracks?
Also, time for a "Yuki Kajiura NHK works" including Eien no Nispa?
So they made whole 6th season for 7 episodes ? And i think its nearly impossible to not have used any new bgm in those 6 years, even if Kajiura has given them use of all her other soundtracks from other projects.