How will WordPress 4.0 language installation work I…

How will WordPress 4.0 language installation work? I probably did not understand it fully, so I am asking:

1) Localized version will be ready several days after releaseRelease A release is the distribution of the final version of an application. A software release may be either public or private and generally constitutes the initial or new generation of a new or upgraded application. A release is preceded by the distribution of alpha and then beta versions of the software. of WordPress 4.0. Which language pack will receive new users in the meantime? Older (and complete) 3.9 language version?

2) There will be any button, that localizationLocalization Localization (sometimes shortened to "l10n") is the process of adapting a product or service to a particular language, culture, and desired local "look-and-feel." is complete or there will be many different translations? I do not want to allow not finished localization for distribution.

3) When I change some stringsString A string is a translatable part of the software. A translation consists of a multitude of localized strings. in GlotPressGlotPress GlotPress is the translation management software that powers Translate.WordPress.org. More information is available at glotpress.org., all users will be automatically updated (every day)?

There are only 2 week to WordPress 4.0 release and there is no discussion with translators how it should work. And also no detail information 🙁