If folders is still regulated to 12 apps per folder and fast app switching on the iPad is only similar to what's on the iPhone, then I'd actually prefer to keep Categories and ProSwitcher.
Plus, what Night Spring said in regards to background apps; it's hilarious that I'm still waiting on iheartradio to update their app, but unofficially I no longer have to worry about what they do either way.
Eventually jail breaking may become more niche as Apple continues improving the Os and essentially catches up with the jailbreakers, but right now, I think that the jailbreak is worth a little bit more than what we might know about iOS 4 on the iPad. Despite some kinks from yesterday, I still love my jb'd iPad.