"DATE: March 11, 2016" "-NEW- Intel® Vulkan BETA 15.40.20.4404 Graphics Driver for Windows® 7/8.1/10 [15.40]"
> https://software.intel.com/en-us/blogs/2016/06/29/new-intel-...
"DATE: June 24 2016" "-NEW- Intel® Graphics Test Driver for Windows® 10 and Windows 7/8.1 [15.40.4473]"
https://software.intel.com/en-us/blogs/2016/06/23/intel-open...
"In his blog published on February 16, 2016, Imad Sousou shared that Intel was selected as one of the leading graphics platform suppliers with Vulkan* 1.0 drivers certified by the Khronos Group Consortium."
https://www.youtube.com/watch?v=bsOTVpepS44
"We are demoing Intel’s implementation of the API available on the latest hardware from Intel on 3 major operating systems: Windows, Linux and Android." Intel Engineer: "This really shows the industry is moving towards Vulkan."
https://www.khronos.org/conformance/adopters/conformant-prod...
Intel sure seems to have been making sure all of their chips are now Vulkan capable. All I can find for "they don't plan to" are what seems like rumors on one forum that are spawned by the current drivers being "unsupported" (but given that they are in beta, that makes sense to me: the storyline here is that they were provided for Vulkan developers to start testing their products and likely testing this driver). It really seems like Intel is at worst being "a little slow" to push Vulkan, but they are definitely not unsupportive.
Microsoft won't support Vulkan officially, and apps would have to install their own Vulkan drivers.