The issue in these three cases is different from almost every other proposal. Most sites will get launched a week or two after 100% commitment. There are a few things we need to do to prep a new site, such a establish the URL, pick the favicon, and so on. But proposals for SO in other languages require significantly more preparation to do right.
The good news is that our recent launch of Stack Overflow em Português has paved the way for many of the technical preliminaries. Now that we've localized a site in one language, it should be easier (technically) to do it in others. Also, the early signs suggest the Portuguese SO launch is among our most successful.
The bad news is that each language comes with non-technical challenges. The biggest is that we need to have at least one community manager who speaks the language. That's a rather substantial investment for Stack Exchange, Inc. Before we launched pt.SO, we didn't know for sure that it would be necessary. But now, it's quite clear that we need to have an employee who speaks the language and knows the culture in order to support the users of a site in another language.
So, for the moment, these three proposals will remain in limbo. We have high hopes we will be able to launch more SO sites in other languages, but we can't give any estimates. (Not even 6-8 weeks.)
I've updated the announcement on those three proposals to read:
This launch is on hold while we add the international features needed to make it functional for this community. Dates will be announced when available.