title: What is the difference between Android 4.4W (API20) and Android L (API20, L Preview) in the SDK Manager?
body: <p>I'm updating my SDK Manager in Eclipse, and there are two new downloads:</p>
  
  <p>Android L (API20, L Preview)</p>
  
  <p>Android 4.4W (API20)</p>
  
  <p>I'm confused because they're both referred to as "API 20".  And I'm not sure what the "W" in "4.4W" is referring to.</p>