1) What are you printing from your iPhone exactly? I am curious. Didn't HP showcase a wireless printing app? Most likely this is not going to be added to the OS. Doubt 90% of iPhone users will print anything. Less stuff to the OS, the better. We still have a very limited device with low memory.
2) (AV out) That would be nice, I thought that was already working before? Did they stop that or take it out in 3.0?
3) I don't think Apple will enable keyboard bluetooth. Very small market for it.
4) Maybe when they release iDisk App, it can be used to send files over email. I doubt Apple will add a user file system to the iPhone, it's a smartphone not a laptop.