A paper entitled "Amplifying the Impact of Open Access: Wikipedia and the Diffusion of Science" was posted on arXiv. It concluded "that the chief effect of open access policies may be to significantly amplify the diffusion of science, through an intermediary like Wikipedia, to a broad public audience" and generated quite some discussion around the interaction of open access and Wikimedia.
The session proposal on the Wikimedia Foundation's new Open Access policy finally did not make it into the program, which leaves Wikimania 2015 with two sessions related to Open Access:
The following represents a selection of the files that have been uploaded this month from open-access sources. Most of these came from PubMed Central through the Open Access Media Importer, whose uploads now total over 20,000. If you can think of wiki pages where these files (or other files from the same source articles) could be useful, please put them in there or let us know.