Worth reading the thread, there are some good insights. It looks like he will be waiting on Postgres to take the initiative on implementing this before it makes it into a release.
>>bvrmn+ULa
I think that's important, because a lot of concepts are presented as prohibitively complicated; for example, functional programming makes sense in my head, but if you present it as lambda calculus and write it in concise form with new operators, you lost me.