Google NaCl and Possible SDK for Chrome OS?

Today Google introduced Nacl SDK, Google's native client is baked into SDK. I think its going to serve as SDK for Chrome OS. In the surface it may sounds like another Flash or Silverlight like thingy but how can otherwise Google can empower Chrome OS? Important point is, it can run any languages -- it may be python, Lua or Google Go(There should be integration point - Ports). I am looking for Nacl SDK for Android and how it can be useful for web development. One point in future Native client app can be bundled with Google Chrome and can be run on any platform which eliminates the need for crapy browser dependency, so write html + CSS +JS and heavy lift using NaCl and bundle it with ChromeOS --- so cloud ready app is just click away.