I just finished setting up a VM and I saw it. Windows 10 S is available in Spanish! I used the 16251 ISO and I discovered that Windows 10 S can be installed. Thanks @Enthousiast for report it first. Spoiler: VM
It is called 1709, that suggests that RTM will be done in September and released to public in October. A rough estimate is about 2-3 weeks, 4 weeks if you take into the account all problems with Fail update.
I think it will be released in September too... In the coming weeks we'll get the final version for testing it.
What is great about it and what changes do you notice in this edition? I use it also (had Enterprise, activated WS using the key) but I don't see anything different , maybe better memory management ,,, I notice mem percentage is only 60% (I have 8GB ram) using MS Edge with 18 tabs whereas before , I had 70-75% mem used running the same apps