What is "Windows 10 s" and it will be elegible to upgrade to 10 Pro?

here is some good information on Windows 10 S:

https://arstechnica.com/information-technology/2017/05/microsoft-takes-on-chrome-os-with-new-windows-10-s/

Both applications built using Microsoft's new Universal Windows Program (UWP) framework, and traditional Win32 applications ported to the Store using the Desktop Bridge (formerly known as "Project Centennial") will be permitted, but Win32 applications that use their own installers will not function.

The Store lockdown is intended to give machines more consistent performance, battery life, and security. UWP store applications are run in tightly controlled sandboxes, and Windows can suspend or even terminate applications to reduce the usage of memory, processor, and battery resources. Centennial applications are much less constrained but are still precluded from installing things like background services and other programs that run automatically, without user intervention. Both UWP and Win32 Store applications use a single mechanism for automatic updates, too, simplifying patching and similar maintenance.

While some schools do indeed equip each student with their own computer, many treat them as shared resources. At the start of each class, students will pick up a laptop from the pile, log in, and then return it to the pile for the next student at the end of the class. This multiuser situation makes security arguably more important than that for privately owned machines. A multiuser setup also requires work to ensure that actions such as the first login to a machine are fast.

Systems used this way also need to offer a full school day's worth of battery life. The constraints on Store applications (and especially UWP applications) should help achieve this, and the next major Windows update, due in autumn and codenamed "Redstone 3," is going to take further steps to limit the resource consumption of background applications.

Although the Store is in many ways an appealing distribution channel—if nothing else, it guarantees clean software installation and uninstallation, and update model is much more convenient than having to update every piece of software individually—application developers have done little to embrace it, and similarly, Windows users do not seem particularly interested in acquiring their software through the Store.

Its intersting to see hows the path that leads to improvement or advantages that may have one OS over the other considernig the individuals needs, and how its evolves , S seems like a perfect choice if youre ok working whit apps approved or ported into The Windows Store , but for Home users as i am, at this time the pro version fullfill my expectatives; im looking forward for the "Redstone 3 Release".
Thanks bro for the info,!!