I see this as a very open and collaborative approach. To announce such a big contribution to Postgres, and be it open sourced when published, is very welcome, and I believe one of the boosts, as I mentioned in the post, that Postgres needs.
I'm also convinced that Babelfish and PostgreSQL will be properly integrated, and this will be a great win. I consider it too a development branch more than a fork, which certainly has "no confidence" connotations. But there's still some worry that it would become one, one day, if there's no sufficient effort towards its integration --as the conversation that I wanted to spark here was almost non-existent up until recently.
This actually brings the topic of more explicitly branch development in Postgres, but it's a different story ;)