title: Xcode 4.5 and iOS 4.2.1 incompatibility
body: <p>The latest release notes indicates 4.2.1 and lower will not be supported, we now have to use 2 version of Xcode to develop when supporting older devices?? This is going to be difficult to support older devices if we want to develop iOS6 AND support 4.2 and lower.  </p>
  
  <p>I don't think Xcode 4.4 will support iOS6. So this is the issue.  How would developers easily support these platform without so much hassle?</p>