Is there a small mistake in the article when comparing WebOS to Android as stretching the "Linux" concept? After all, Androis is the one re-implementing everything above kernel, while WebOS uses GStreamer, Pulseaudio et cetera. Granted, it has its own UI stuff, but it's still the GNU/Linux type of Linux with several huge middleware portions (and also Qt as optional library) that are common with other Linux distributions.
When/if Samsung comes with its Tizen variant with the rumored E17, it's no more different than WebOS since E17 is relatively unique as well as being pushed by a major player.
Of course WebOS UI framework is proprietary so far, which is a bit differing factor. Let's see if the plans to free it up come to life, and if it's of any interest in the Qt5 / GTK3+Clutter / HTML5 era.