From 1 August 2016 there are changes to the Windows 10 edition line-up: you can still buy Windows 10 Enterprise but there are now also E3 and E5 editions. So, what’s the story here? Well, Windows 10 Enterprise E3 is the new name for Windows 10 Enterprise + SA, and Windows 10 Enterprise E5 adds Windows Defender Advanced Threat Protection on top of E3. Both editions are available on per user or a per device basis – check out this page for the details: http://bit.ly/2bgmb2L.
Then take a look at page 37 of the August 2016 Product Terms document to see the new SKUs that are available. Of particular note are the Add-ons which allow you to move between editions and licensing models. This means that you can go from E3 per device to E5 per device, or from E3 per device to E3 per user, or from E3 per user to E5 per user, and you’ll find the rules for these Add-on licences detailed on page 41. In addition, if organisations have fully paid licences for Windows with active SA then they can purchase E3/E5 From SA User SLs instead of SA to move to a user licensing model for Windows (page 42).
It’s also worth mentioning at this point that there are some changes with MDOP with two of the components (Application Virtualization (App-V) and User Environment Virtualization (UE-V)) now part of Windows 10 Enterprise. This Microsoft site is useful for the detail on this: http://bit.ly/2aYEcAi.