Next userland jailbreak for iOS 4.1 could possibly jailbreak iPod Touch 4G as well. The exploits, reportedly, in possession of comex might work for iPod Touch 4G jailbreak as the newly launched iTouch 4G will run iOS 4.1 which could be jailbreakable with a tool like JailbreakMe or a spirit-like tool. It’s not certain though as it’s a new hardware and finding exploits might be difficult. There’s a hope though but it’s something that time will tell. As for now, iOS 4.0.2 is not jailbreakable as it includes the fix to the security hole in Safari browser that was used by JailbreakMe.