I do not think Kotaku made an article as soon as developer knew about Neo and told them though.
I wonder for how long devs talked about it.
And you somehow think that Microsoft didn't start development for Project Scropio before Spencer mentioned that something like that might be a good idea? As a related side note, Dx12 started development well before Dx12 was announced or hinted at. Mantle was announced and a BETA implementation released between when Dx12 started development and Dx12 was actually announced. People ended up erroneously thinking that Dx12 was a panic response from Microsoft to the release of Mantle. That obviously wasn't the case.
The same goes for Project Scorpio. Unless you are hopelessly incompetent or you are crowd funding something you don't announce or hint at something until you've already done significant work to see if a product is viable and has a solid foundation for further development. That applies to both Sony and Microsoft.
It's quite obvious that Microsoft wanted to abstract the software from the hardware as much as possible. Not only to facilitate forwards/backwards compatibility for games, but to accommodate potential changes in hardware. Microsoft isn't a stranger to having to deal with software operating on multiple different hardware architectures as well as multiple different hardware generations. It's been their business for over 4 decades now.
And while x86 has been the foundation for most of their success, you can see them even now gaining experience on running their software on ARM based devices. They certainly aren't a stranger to RISC based devices (DEC Alpha ran a version of Windows NT, Windows CE ran on a variety of RISC based designs, etc.).
While I'm sure they are prepared to stay with x86, even there the groundwork has been laid for a transition to ARM if required as UWP is designed to allow application code to be compiled to run on both x86 and ARM. That said Project Scorpio isn't going to deviate from x86 as games developed for XBO aren't UWP applications. However, at some point after Project Scorpio when XBO no longer needs to be supported and UWP is more universal for game code on Xbox, it's entirely possible they could switch to an ARM based console while still maintaining backwards compatibility with the x86 based consoles.
TL: DR. When Microsoft made the move to the OS model used in the XBO, they were already committed to the idea of a moving hardware target in shorter timeframes than traditional console generations. UWP is work they have put in that synergizes and expands upon that. Not just allowing for updates in the GPU but also allowing for changes in the underlying CPU.
Regards,
SB