On the Magenticians site there's a new post that provides an update of sorts, a post-mortem really, about their opinion of the "open source-ness" of the Magento product and project.

Little less than four months ago, we published an opinion-piece regarding Magento 2 and why we thought it wasn’t really holding up to the mindset of being an open source project. In four months, a lot has changed. [...] Magento 2 was (and still is) being marketed as a new platform which not only refreshes the entire code base, but also improves handling of the community its feedback and involvement. [...] Most of the original critique was therefore that, though by definition Magento 2 is an open source project, all the rest which should naturally come with “being open source”, severely lacked. It is one of our best read articles and linked from a dozen of websites; a timely status update is in its place.

They go on to update some of their original comments and note that things "feel more like open source" with changes including direct pushes to GitHub (not mirrored) and better external communication. They point out a few other smaller things including their developer hub, updated developer documentation and more informative blog posts about the project/project.