This announcement is a very positive step forward! The members of the language committee deserve great credit for their willingness to re-think these proposals. I am truly grateful, and I'm sure many others who put great effort into trying to improve the language proposal policy last year are grateful as well.
To my mind, the most important thing by far in the announcement has to do with Latin (alongside Esperanto). Here the rules themselves were never really the issue, but rather the ability to make a reasonable evaluation of "special" languages on a case-by-case basis. Latin is "special" because on the one hand it has a popular reputation as the ultimate "dead" language in Western culture. But on the other hand in reality it is very much alive in literature and culture (both academic and popular), in the discourse of living religious communities (the Catholic Church), and even to a degree in science (e.g. medicine, zoology). The decision to reconsider Latin as a living language, thus finally giving it full legitimacy among the Wikimedia projects, is of crucial importance! Thank you.
Given this evaluation of Latin, a re-evaluation of classical Greek might also be in order. While not as popular as Latin, nevertheless like Latin it too is still very much alive in literature and culture (both academic and popular) and in the discourse of living religious communities (the Orthodox Church), though far less so in science.
Also important and positive is the official decision to allow Wikisources for ancient languages, and sometimes Wikiquotes, based on case-by-case evaluations. I'm not fully convinced that the default interface should always be English as a requirement (since those studying a rich literature should be able to create and handle an appropriate native interface), but ultimately I don't think the question of default interface language is a very important one. Rather, what is truly important and positive is the willingness to consider such languages on a case-by-case basis and arrive at a reasonable conclusion regarding each one. From this perspective, the conclusions reached about Wikisources/Wikiquotes in Coptic, classical Greek, and classical Chinese all seem eminently reasonable.
Dovi