Even if they have, they are known for super strict security rules, so it won't be disclosed. I saw a link to their patent application where they patented a way to protect the current keyboard design from dust and crumbs. Personally, I got tired of their disregard for software developers issues with hardware, and now my working machine in the new XPS 13 from Dell. I am happy with it.
So what is it with software developers and laptops? The portability? Or rather people just being used to a laptop since they are ubiquitous in college. Even plugged into monitors, laptop keyboards just plain suck.
I have an XPS-13, and it's handy for field use with GNU Radio, but can't fathom doing anything productive on it.