In the past, things like this used to be done for signing certificate rollovers.

I wonder what this means:

> When analyzing the code of one of the apps that received an Apple update, MacRumors could not find what had changed.

Unfortunately, it's put so vaguely, it could either mean the diff showed no code changes - or they were unable to compute a diff, for whatever reason.

If it's the former, that would be a strong indication for certificate issues, I think.