These were not well-guarded secrets (and the ideas were pretty "obvious" if you had faced the problems before in dealing with Bazel and large codebases). In tal

These were not well-guarded secrets (and the ideas were pretty "obvious" if you had faced the problems before in dealing with Bazel and large codebases). In talking to people at the conference, several knew about these efforts (and some even knew the codenames), so I assume these had been mentioned here-and-there in discussion threads.