Is (or will) Ferrocene be open source?

… exclusive early access to Ferrocene releases …
exclusive

This phrase look suspicious, as “open source” and “exclusive” typically does not mix well.

Will it be a special version of rustc with private bugfixes, like in ~“we have fixed 19 bugs in rustc that can lead to miscompilations in your missing-critical program, so you better pay us for better private rustc instead of using buggy upstream version”~?

Or will publicly available source code be exactly the same as in certified version of the compiler, with the difference only being the legal warranties?

Or will it follow something like grsecurity model, i.e. technically open source, but please do not distribute (lest lose the subscription).

So that tabs with lemmyrs posts would be easily distinguishable from tabs of docs.rs and the forums. Docs.rs have somewhat different role, so tabs with it is less likely to be intermixed in the tree with other ones. But IRLO/URLO and Lemmyrs serve comparable roles and are likely to link to each other, so distinctive favicons can help.