As of this morning, the first app mentioned in my blog post is no longer available for purchase, and the second application is now only for sale in Egypt.
Unfortunately, the bundle id is just stored in a plist file, and it's actually quite easy to re-sign an app bundle with a different profile after modifying it.
Correct, they are simply updating the image resources and resigning the app. The code hasn't been touched (though the code is from a two year old version of the app).