This graph depicts the number of modules now stable since January 2016. This time last year there were 1,028 stable projects and this year there are 1,860 stable projects, representing an 81% increase year-over-year.
This roadmap depicts Drupal 8.5, 8.6, and 8.7+, along with a column for "wishlist" items that are not yet formally slotted. The contents of this roadmap can be found at https://www.drupal.org/core/roadmap.
This graph depicts the number of Drupal 8 sites built since April 2015. Last year there were 159,000 sites and this year there are 241,000 sites, representing a 51% increase year-over-year.