While some company watchers said they believed Microsoft's long-rumored Surface Phone might be an Intel-based device, I never heard that from my contacts. Whenever I heard from my contacts about a Surface Phone, the device always was described as ARM-based, which makes sense to me, as ARM continues to be a better in terms of power efficiency. Traditional Win32 apps can't run on ARM-based devices, but Remote Desktop software/services does provide a solution (though a complex and often pricey one)
I went back and looked at notes from a conversation I had with Windows and Devices chief Terry Myerson just prior to the Aug. 2 release this year of Windows 10 'Redstone 1". (I didn't run his response on mobile and chipsets before now, as it didn't seem material to my post about the Windows 10 Anniversary Update.)
But here's what Myerson told me when I asked about Windows 10 Mobile ever running on Intel: "Today, Windows Mobile is for 7- or 8-inch devices running the ARM chipset. Over time, you will see our goal is to give partners access to all screen sizes and chip sets of choice."
(Blass said Dell and Intel were working together on the concepts since 2014, which means they may have withered when Microsoft's initial plans to have Windows 10 Mobile run on Intel didn't materialize right out of the gate. Or maybe the tablet shown in the renders Blass posted was/is just going to run plain-old Windows 10 and not Windows 10 Mobile.)