[Harry K.]

2.0 has been put on hold.

1.9, 1.10 etc.. will be coming first.
1.9: Responsive default theme + Twig Template conversion
1.10: Feature release with most needed features from 2.0 suggestions.

Staff still say 1.9 is way off! Will require php 7.1(or 7.2)
1.9 Dev Roadmap: https://community.mybb.com/thread-215212.html
Update: https://community.mybb.com/thread-215211.html

All in all, don't get your hopes up yet. MyBB is far behind. 1.9 will be way outdated(already...) same with 1.10. 2.0 Will probably eventually be trashed unless someone like effone, Shade, or Euan has the time to seriously pick up speed on development.