The various proposals have been circulated amongst a small group of core Go contributors. That has been sufficient to drive the process so far, with many options being explored in detail. The work continues to evolve.

We're not university professors. We're not publishing papers or other "researchy output". We're just trying to get stuff done. If we publish all the works-in-progress we will distract the community from the more pressing concerns of today's Go programmers. We all already spend way too much time reading mail, and generics is a hot topic (obviously). The last thing we need is more (redundant) mail.