I hoped I'd have more time before things started popping up, but I'm beginning this new list of information.
(1/2/16): According to this blog (taikamiyaa.tumblr.com/post/136…) there's going to be a Digimon Tri New Year's special on January 15th. I don't know what that entails, but we'll probably hear some news about the next movie then.
(1/15/16): A new teaser is out for the next movie ([link]). There's a shadowy figure at the end that seems to resemble Ken as the Digimon Emperor. The 02s may still be alive. Whether that's a good thing or not, I don't know. (Although some say it looks more like Tai than Ken, but what would that mean?)
Stay tuned for future updates.