During the Berlin community meetup (2015) preparation sessions, mission and values were updated: - https://github.com/piwik/piwik/wiki/Our-mission-and-values - https://github.com/piwik/piwik/wiki/Our-mission-and-values/_compare/446bd8220e700620631ed65b4ac866232a364c12...3cd30bd7b30dc03175851c446d2096da2108cc6e - http://piwik.org/roadmap/
This was also presented at the community meetup.
Among other feedback I brought up making this information more visible. One way would be to have a top page at Piwik.org for MIssion and Values, also linked from the left menu under "About".
Thanks @MagicFab for the suggestion, we're also discussing our updated Piwik Mission statement and values in the RFC in #8518