The Apache Cordova plugin repo (http://plugins.cordova.io/#/) is offline, this will result in failed builds.
We will update this post and tweek to @Intel_XDK when this has been resolved.
The Cordova.io registry is a third-party site maintained by the Apache Cordova project team and is not under out control. Plugins that you reference by ID (e.g., com.some.cool.plugin) are pulled from this registry. Attempts by our build system to retrieve those plugins will fail.
In addition, using the Intel XDK Early Access system and the current version of the Intel XDK may fail when you attempt to use the Emulate tab.
If you reference plugins via a GitHub repo, or locally, you will not experience a problem with this issue.
p.s. Future versions of the XDK are under development to minimize dependency on these third-party issues.
---- update ----
The Cordova plugins registry is back online. If you have build problems double-check the availability of the Cordova registry using this link: http://plugins.cordova.io/