PSP firmware 3.60 reveals hidden USB Charge feature, not compatible with PSP v1

Some people who have managed to get their hands on the new PSP Slim noticed the USB will NOT work with the old PSP?. They found the following new features; UMD cache - to increase the loading speed of games, USB charge - charge the PSP battery via USB and Connected Display Settings which features all the options to output video from your PSP.Is this something that can be easly hacked or otherwise changed im sure some of you smarter guys can sort something out! or is it a hardware isue? Ho i heard it comes with a 62meg rom too. sorry if this is common knowledge.