The Windows 10 mobile SKU will run on both Intel- and ARM-based tablets and phones, according to that same slide. (I believe is the coming version of Windows 10 for Windows Phones and small tablets
that is due to go to preview in February.) The Compact/Athens SKUs, which also run on both Intel- and ARM-based devices, is for resource-constrained devices that need to run Universal Apps. The next version of the .Net Micro Framework, designed for wearables, small sensors and equipment like vending machines.