Twitter #openaccess and #OA posts are great for identifying current issues, conferences and reports.
The Scholarly Kitchen blog frequently posts critical analysis & discussion of open access issues, seen mostly from a publisher's perspective.
Below are a selection of readings to illustrate various perspectives:
University of California takes a stand on open access. (2019, 8 March). Science.
Allington, Daniel. (2013, 15th Oct). On open access, and why it's not the answer.
Beall, Jeffrey. (2015, May-June). What the Open-Access Movement Doesn’t Want You to Know. Academe.
HEFCE (2015). Monographs and open access.
Eve, Martin Paul. (2013). Utopia Fading: Taxonomies, Freedom and Dissent in Open Access Publishing. Journal of Victorian Culture, 18(4).
Evelth, Ross. (2014, Dec. 22). Free Access to Science Research Doesn't Benefit Everyone. The Atlantic.
Journal declarations of independence A list of journals whose editors and/or staff resigned in order to launch a comparable journal with a friendlier publisher or less-restrictive access policies. The Scholarly Kitchen argues that "their impact on the scholarly communications ecosystem seems quite muted"
Lawson, Stuart and Gray, Jonathan and Mauri, Michele, Opening the Black Box of Scholarly Communication Funding: A Public Data Infrastructure for Financial Flows in Academic Publishing (November 13, 2015). Available at SSRN: http://ssrn.com/abstract=2690570
Science's Special Issue on Communication in Science: Pressures and Predators. October 4, 2013.