With the numbers I've read, AAC plus should be able to deliver the same audio quality at 48kbps as AAC at 128kbps.
128/48 ~ 2.7, round that down to 2.5, which means iPod mini would fit 2500 songs instead of 1000.
But if they upgrade the HD to 5GB, that means 3000 songs instead of 1000. A nice "three times more storage space" is easy to use in marketing. It also upgrades all the current (and older?) iPods capacities by 2.5. 😎
The question is, can the other iPods be updated with AACplus? I have doubts for the 1st and 2nd generation, but what about the 3rd? And most important, will Apple update the firmware of the older iPods (if the iPod can do it). Will they "updgrade" the iTMS songs to AACplus? Will they keep using the "old" AAC at 128kbps?
As for myself, it would mean I'd have to re-rip all my 50+ CDs, but it would turn my 10GB iPod into a ~25GB iPod, and lower my 7.61GB collection to about 2.86GB...I'd go from only having 24% space left to having just a bit over 10% used. 😀
Edit: just realized that with AACplus, I wouldn't even NEED my 10GB iPod, I'd have more than enough space with a 5GB iPod mini! Dark Blue please 🙂