Unrelated news, but it looks like Lucasfilm is getting ready to produce another Star Wars series after Rebels ends:
https://jobs.disneycareers.com/job/s...re/391/6872423
Also the series finale will be 90-minutes and Ian McDiarmid is confirmed to voice the Emperor:
http://ew.com/tv/2018/01/19/star-war...ailer-emperor/