Maybe the days of Star Wars as a May release are well and truly over. The Force Awakens broke a six movie streak by coming out in December, and while Episode VII was supposed to restore balance to the calendar, Disney has just announced that they are pushing it from May 2017 to December 15, 2017.
This comes on the heels of reports that shooting on the new film has been pushed back due to rewrites inspired by the popularity of the new characters (for perspective: Poe Dameron originally died in The Force Awakens. That change alone probably forces a reconfiguration of the entirety of Episode VIII).
As far as I'm concerned this is nothing but good news - the more time Rian Johnson has to make Episode VIII the best Star Wars since The Empire Strikes Back the better. Those extra months will give him the time to get the script in the best possible condition, something I think we all could use after The Force Awakens. Those extra months will serve to make Episode VIII as good as it can be. I'm all for it.
By the way: Avatar 2 is currently set for December 25, 2017 - ten days after this date. Either Disney knows that Fox isn't making that date for Avatar 2 or we are about to have a major, huge battle on our hands. It should be good.