From today, Microsoft Dynamics NAV 2017 is available for download. You can find download link on PartnerSource. But currently it has some issues when you try to download (I hope it will be solved soon).
On this link you can find W1 version and all official localizations and language modules. Partner Translation Toolkit will be available soon, but you can find system requirements, installation information and release notes. We can find all information about process of ordering NAV 2017 license for new and existing customers as well.