My understanding is that this OUPS meeting is precisely intended to coincide with an "official annoucement" of the system, so I would recommend waiting for a couple more weeks before looking at the system (surely they have polishing planned before that) and discussing it.
I would tend to agree with your implicit remark about unclear project status (internal/external, announced/secret, released/experimental) in the general case; but I understand that everyone is free to handle their project as they deem acceptable. I'm personally fine with waiting a bit -- and this is still better than ocp-build or ocaml-java.