I'm not sure what the "upgrade" will do if your tunes are ripped at higher quality. All of mine are in Apple Lossless, for example. If Apple "upgraded" me to 256kbit/sec compressed audio, I wouldn't be amused.

On the other hand, if all 40k tracks I have in my home computer could suddenly be available on everything else without any trouble, that might be interesting. It would be even better if they supported the iTunes app on Android. Yeah, that'll be the day.