iOS 4 feature compatibly list

[lostngone]

Ok we all know what devices iOS 4 supports.

Apple stated that not all features will work on older devices, like multitasking on the iPhone 3G.

My question is, does anyone have a breakdown of all the software features in iOS 4 that are not supported on the older devices like the 2nd Generation iPod Touch and the iPhone 3G.

 

[celticpride678]

1. Multitasking
2. Wallpapers on the home screen
3. Bluetooth keyboards
4. This is still unknown, but iBooks could be.

 

[Willis]

Home Screen backgrounds aren't supported... Not sure on any others as yet.

 

[lostngone]

What about..

Bump...

What about Digital zoom?

Has any seen a feature list of exactly is and is not supported broken down for older devices.
Other then the little note on Apples site that says "Not all features are compatible with all devices."