[cwyers]

"But it does solve their biggest issue - ultimately enabling Unity projects to publish to the web without plugins (WebGL / javascript)."

I'm not really sure that is their biggest issue; HTML5 publishing of Unity games seems mostly a novelty at this point.

[azakai]

It is still pretty new, yes, but it seems to work well (see for example https://hacks.mozilla.org/2014/10/unity-games-in-webgl-owlch... ), and it's been one of the most-asked for features by Unity users on their forums.