I think it would have been good if they started shifting all their devices to USB 3.0. Especially if the devices are now taking 4k video, transferring extremely large video files back and forth over USB 2.0 is irritating.
It's a minor annoyance. I just found it strange that they went back to USB 2.0 there. Assumed it would be USB 3.0 again.
I agree with that.
While the parts have gotten better from the Note 3 to Note 4 (screen, camera, processor etc), the UI seems largely untouched. I think the user experience for the Note 4 will most definitely be similar to the Note 3. I don't think Note 3 users would be missing out on some sort of amazing piece of tech if they held on to their phones.
Note 4 is an evolutionary upgrade, and that's great. Great for people who haven't had a new phone in a while - the Note 4 will be a big update. Great for Note 3 users who don't want to shell out the $outright or re-contract as it won't be catastrophically different from what they already have.