I would MUCH rather see two miniDP ports, rather than one miniDP and one HDMI. The miniDP to HDMI adapters are only $10 and they work great. Hooking up a second monitor to an HDMI source on the other hand... not so easy. Plus you might only be able to use 720p and 1080p resolutions.
Why is this even an issue when it comes to iTunes? There have been Album-Only songs since day one. If Pink Floyd want it so you must buy their whole album, let em? I don't see how it's an issue? It will probably mean fewer Floyd songs sold, and people who buy the whole album will still listen on shuffle anyway.
I can totally see how a problem where all user's phone data is permanently lost forever, is just as bad as a very rare problem where some people lose local data that they probably have a backup of anyway . . . I have yet to talk to anyone who has had their data disappear from this guest account problem.