Who knows. Being part of the working group might mean they are considering it. Or may be not. MS though lets everyone know now that they don't care (by not being part of the group).
> So how are they again different from MS?
They are pretty similar in many (bad) ways, including the issue of lock-in. Apple is probably even worse these days.
Or for that matter where are the Vulkan implementations for Sony and Nintendo consoles?
Being a logo on a web site has zero value besides PR, if they don't bring out support to their devices.
So how are they again different from MS?