What is the release schedule of the Digimon Adventure tri. movies?
Crunchyroll has released some information pertaining to the Digimon Adventure tri. movies. 

Information from Crunchyroll post:


  Plans are being lined up for the second part of Digimon Adventure Tri: "Ketsui" (Determination), which opens for a limited theatrical run on March 12, 2016. Mimi Tachikawa's Hitomi Yoshida and Joe Kido's Junya Ikeda will be presenting a preview at Shinjuku Wald 9 on February 11th. Along with the news is a preview, that revealed the big detail that finale, "Kokuhaku" (Confession) is scheduled for summer 2016.


According to this post, the finale will be released in summer of 2016. However, this seems unlikely due to the fact that the second part of this six-part series is just being released on March 12th. I will update this answer if they change the date of the finale.