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Which languages to add, and which not to add.
Just a short note to say that Wikipedia adopted the policy to only create Wikipedias for languages that have an ISO 639-3 Code. There might be exceptions. I think this decision helped them pretty much ease the process for new languages.
Yep we used to have a discussion about that, and we don't plan to only add languages which have an ISO 639 alpha 3 code, wikipedia as to do this because they have tons of contributors, and an encyclopedia need much more data than just a database of example sentences, so I can understand why they don't prefer to have a lot of articles rather than a lot of dialects or so
but for us, I think as soon as the language is enough different to be not totaly intelligible with an other, then we can add it as a specific language (that's the case for shanghainese for example, the closest ISO 639 code is for Wu language, but the Wu language, for which shanghainese is a "dialect", is divided in some other "dialects" (even i don't really like the word "dialect"), which are not intelligible with shanghainese)
and as I think tatoeba can be used to keep a trace of language, especially endangered ones, I would find really pityfull to not add a small language, only because it has no iso 639-3 code (moreover I've heard iso 639-4 code will be released)