....iPhone OS 4 Compatibility
iPhone OS 4 will work with iPhone 3G, iPhone 3GS, and the second- and third-generation iPod touch this summer, and with iPad in the fall. Not all features are compatible with all devices. For example, multitasking is available only with iPhone 3GS and the third-generation iPod touch (32GB and 64GB models from late 2009)......[Source: Apple]
To user of iPhone 3G & second-generation iPod touch. Apple decided that this could provide the user a incentive to upgrade to the latest version...we shall see when the iPhone 4.0 launch...
