Here's what I think will/want to happen:
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I believe that they may change the casing of the Macbook to aluminum, this might either look good or bad.
The MB will have capacity upgrades.
And it will most likely be available in black and silver.
I don't know how they could upgrade the iMac other than making the screen bigger, giving it spec bumps, and lowering the price.
I'm not sure about the Mac Mini; not a great fan mainly because of it's specs.
But if it does get an upgrade it will probably get a nice spec upgrade and both version will have a superdrive instead of combo drive or super drive.
I'm really upset that no one has mentioned the iPod Classic (well I could be wrong since I didn't bother reading pages 4 and 5).
There is very slim chance that it will be dropped.
It will probably have a capacity upgrade, maybe a new screen with better resolution, and possibly a redesign.
The iPod Touch is something that I really hope gets a nice upgrade.
It will most likely have a capacity upgrade, possible camera, possible new back covering, and a new software update.
I don't really know what to expect out of the Nano.
It's probably going to be available in 16GB.
It may have a redesign to it, I'm not sure.
There are also rumors going around that it may come in multiple colors.
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I have also just noticed a pattern that Apple is doing and that is probably going to continue throughout November; this also backs up what other people are saying:
July - iPhone 3G
August - Fix bugs in iPhone 3G and make 3G range bigger.
September (9th?) - iPod update and possibly Apple TV
October - Notebooks; MB/MBP
November - Macs; iMac/Mac Mini
So as you can see I think that Apple is going on a huge updating session that's probably going to last 5-6 months.
And who knows, there may even be a couple more udpates in February like there were for the iPod Touch and iPhone.