You're correct, it's a bug. I'll file a request to change. In the meantime, you can add the correct icon by adding these lines to your intelxdk.config.additions.xml file and, obviously, adding the appropriate icon to the package-assets folder:
<platform name="ios"> <icon src="firstname.lastname@example.org" width="167" height="167" /> </platform>
You can name that icon file anything you want and using the ios folder is up to you, this is just an example. This is the standard Cordova tag for adding icons.